Author: claimsbot

1. A compound conforming to the structure of Formula (I):
wherein R1 is carbonyl or sulfonyl;
R3 is a substituent selected from the group consisting of \u2014OR4, \u2014NHR4, and \u2014NR4R4; wherein R4 is selected from the group consisting of \u2014R5\u2014O\u2014R6\u2014R7 and \u2014R6\u2014R7; R5 is alkyl or aryl; R7 is hydrogen or alkyl; and R6 is a divalent substituent selected from the group consisting of
divalent oligomeric substituents comprising two or more divalent repeating units independently selected from repeating units conforming to the structure of Formula (V)
wherein R20 and R21 are independently selected from the group consisting of hydrogen, alkyl, hydroxyalkyl, aryl, alkoxyalkyl, and aryloxyalkyl.
2. The compound of claim 1, wherein R6 is a divalent oligomeric substituent comprising two or more monomers selected from the group consisting of ethylene oxide, propylene oxide, and butylene oxide.
3. The compound of claim 2, wherein R6 is a divalent oligomeric substituent conforming to the structure of one of Formulae (XIII)-(XV)
x, y, and z are integers from 0 to 100, and the sum of x, y, and z is 2 or greater.
4. The compound of claim 1, wherein R1 is sulfonyl, and R3 is \u2014NHR4.
5. The compound of claim 4, wherein R4 is \u2014R5\u2014O\u2014R6\u2014R7, R5 is C1-C10 alkyl, R6 is a divalent oligomeric substituent conforming to the structure of one of Formulae (XIII)-(XV)
x, y, and z are integers from 0 to 100, and the sum of x, y, and z is 2 or greater.
6. The compound of claim 4, wherein R4 is \u2014R6\u2014R7, R6 is a divalent oligomeric substituent conforming to the structure of one of Formulae (XIII)-(XV)
x, y, and z are integers from 0 to 100, and the sum of x, y, and z is 2 or greater.
7. The compound of claim 1, wherein R1 is sulfonyl, and R3 is \u2014OR4.
8. The compound of claim 7, wherein R4 is \u2014R5\u2014O\u2014R6\u2014R7, R5 is C1-C10 alkyl, R6 is a divalent oligomeric substituent conforming to the structure of one of Formulae (XIII)-(XV)
x, y, and z are integers from 0 to 100, and the sum of x, y, and z is 2 or greater.
9. The compound of claim 7, wherein R4 is \u2014R6\u2014R7, R6 is a divalent oligomeric substituent conforming to the structure of one of Formulae (XIII)-(XV)
x, y, and z are integers from 0 to 100, and the sum of x, y, and z is 2 or greater.
10. A laundry care composition comprising a laundry care ingredient and the compound of claim 1.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. An adjustor configured to position an antenna coupled to a mounting element, the adjustor comprising:
an adjustor nut comprising a bore extending along a longitudinal axis of the adjustor nut from a distal end region to a proximal end region of the adjustor nut, at least a portion of the bore having inner threads configured to engage corresponding threads on a first portion of the mounting element positioned within the bore;
a tool interface positioned near the proximal end region of the adjustor nut;
an external fastening mechanism positioned near the distal end region of the adjustor nut; and
a preload nut configured to engage the external fastening mechanism and configured to apply a load onto a second portion of the mounting element positioned between a portion of the adjustor nut and the preload nut,
wherein rotation of the adjustor nut around the longitudinal axis causes movement of the first portion of the mounting element along the longitudinal axis while the load is applied onto the second portion of the mounting element.
2. The adjustor of claim 1, wherein movement of the first portion of the mounting element along the longitudinal axis adjusts the antenna along an elevation coordinate, an azimuth coordinate, or a polarization.
3. The adjustor of claim 1, further comprising a locknut.
4. The adjustor of claim 3, wherein the locknut is coupled to the mounting element.
5. The adjustor of claim 3, wherein the locknut is coupled to the adjustor nut.
6. The adjustor of claim 5, wherein the locknut comprises a central bore having a threaded region and an unthreaded region forming a tapered shoulder, wherein the central bore is configured to receive the distal end region of the adjustor nut.
7. The adjustor of claim 6, wherein the threaded region is sized to engage at least a portion of the external fastening mechanism positioned near the distal end region of the adjustor nut.
8. The adjustor of claim 7, wherein when the locknut is loose, the locknut travels along the longitudinal axis during movement of the first portion of the mounting element.
9. The adjustor of claim 7, wherein when the locknut is tightened, the locknut prevents movement of the first portion of the mounting element along the longitudinal axis.
10. The adjustor of claim 7, wherein an outer surface of the distal end region of the adjustor nut forms a tapered region.
11. The adjustor of claim 10, wherein the tapered region comprises one or more slits extending through a wall of the distal end region.
12. The adjustor of claim 11, wherein tightening of the locknut via rotation advances the locknut toward the proximal end region of the adjustor nut causing engagement between the threaded region of the locknut with at least a portion of the external fastening mechanism of the adjustor nut.
13. The adjustor of claim 12, wherein further tightening of the locknut via rotation advances the locknut further toward the proximal end region of the adjustor nut causing the tapered shoulder of the locknut to wedge against the tapered region of the adjustor nut.
14. The adjustor of claim 13, wherein the tapered shoulder of the locknut wedged against the tapered region of the adjustor nut narrows the one or more slits of the tapered region and reduces an inner diameter of the tapered region.
15. The adjustor of claim 14, wherein reduction of the inner diameter locks the adjustor nut onto the first portion of the mounting element.
16. The adjustor of claim 15, wherein locking the adjustor nut prevents rotation of the adjustor nut around the longitudinal axis.
17. The adjustor of claim 1, wherein the at least a portion of the bore having inner threads is within the distal end region of the adjustor nut.
18. The adjustor of claim 1, wherein the at least a portion of the bore having inner threads is within the adjustor nut from the distal end region to the proximal end region.
19. The adjustor of claim 1, wherein the external fastening mechanism comprises a fixation ring, pop rivet, weld, bond, interference fit, thread or combination thereof.
20. The adjustor of claim 1, wherein the external fastening mechanism comprises an external thread.
21. The adjustor of claim 20, wherein the preload nut comprises a central bore having an inner thread configured to engage the external thread of the external fastening mechanism.
22. The adjustor of claim 21, wherein rotation of the preload nut provides engagement between the inner thread and the external thread to advance the preload nut towards the proximal end region of the adjustor nut thereby applying the load.
23. The adjustor of claim 22, wherein rotation of the adjustor nut does not affect the load applied by the preload nut.
24. The adjustor of claim 20, wherein the adjustor nut provides a first bearing surface against an external side of the second portion of the mounting element and the preload nut provides a second bearing surface against an internal side of the second portion of the mounting element.
25. The adjustor of claim 24, further comprising one or more washers, spacers, cushions, bushings, bearings, springs or combinations thereof to reduce friction between the first bearing surface and the second bearing surface.
26. The adjustor of claim 1, wherein rotation of the tool interface rotates the adjustor nut.
27. The adjustor of claim 1, wherein the tool interface is integral with and forms the portion of the adjustor nut such that the second portion of the mounting element is positioned between the tool interface and the preload nut.
28. The adjustor of claim 1, wherein a tool configured to couple with the tool interface is also configured to couple with the preload nut.
29. The adjustor of claim 28, wherein the tool configured to couple with the tool interface and to the preload nut is also configured to couple with a locknut configured to prevent movement of the first portion of the mounting element along the longitudinal axis.
30. The adjustor of claim 29, wherein the tool interface is a hex head.

1-16. (Canceled).
17. An image pick-up optical system comprising:
a refractive type lens; and
a diffractive optical element having a diffraction efficiency more than 0.8 for a wavelength range from 0.4 m to 0.7 m, said diffractive optical element and refractive type lens being arranged along an optical axis of the image pick-up optical system.
18. The image pick-up optical system according to claim 17, wherein said diffractive optical element includes first, second and third optical regions which are arranged successively viewed in a direction of the optical axis, a first relief pattern formed in a first boundary surface between the first and second optical regions, and a second relief pattern formed in a second boundary surface between the second and third optical regions.
19. The image pick-up optical system according to claim 18, wherein a depth d1 of the first relief pattern and a depth d2 of the second relief pattern are smaller than 10 m.
20. The image pick-up optical system according to claim 18, wherein a depth d1 of the first relief pattern is smaller than a depth d2 of the second relief pattern.
21. The image pick-up optical system according to claim 18, wherein an Abbe’s number u1 of the first optical region is larger than an Abbe’s number u3 of the third optical region.
22. The image pick-up optical system according to claim 18, wherein each of said first and second relief patterns is constructed as a blazed grating.
23. The image pick-up optical system according to claim 22, wherein a surface of the first optical region opposed to the surface in which the first relief pattern is formed is curved and a surface of the third optical region opposed to the surface in which the second relief pattern is formed is curved.
24. The image pick-up optical system according to claim 22, wherein each of said first and second relief patterns has a sawtooth cross sectional configuration including sharply raising sides and gently raising sides.
25. The image pick-up optical system according to claim 24, wherein each of said first, second and third optical regions has a substantially constant refractive index.
26. The image pick-up optical system according to claim 25, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
27. The image pick-up optical system according to claim 24, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with top and bottom portions of the second relief pattern, respectively.
28. The image pick-up optical system according to claim 27, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
29. The image pick-up optical system according to claim 27, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
30. The image pick-up optical system according to claim 27, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are extended up to points situating between the bottom portions and the top portions of the second relief pattern viewed in the direction of the optical axis.
31. The image pick-up optical system according to claim 24, wherein said first and second relief patterns have an identical pitch distribution and are aligned in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with bottom and top portions of the second relief pattern, respectively.
32. The image pick-up optical system according to claim 31, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
33. The image pick-up optical system according to claim 31, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
34. The image pick-up optical system according to claim 22, wherein each of said first and second relief patterns has a rectangular cross sectional configuration having top and bottom portions.
35. The image pick-up optical system according to claim 34, wherein each of said first, second and third optical regions has a substantially constant refractive index.
36. The image pick-up optical system according to claim 35, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
37. The image pick-up optical system according to claim 34, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that the top and bottom portions of the first relief pattern are aligned with the bottom and top portions of the second relief pattern, respectively.
38. The image pick-up optical system according to claim 37, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
39. The image pick-up optical system according to claim 37, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
40. A camera comprising an image pick-up optical system according to any one of claims 17-39.
41. A camera comprising:
an image pick-up optical system for forming an image of an object to be picked-up; and
an image pick-up element receiving the image of the object and generating an image signal: wherein said image pick-up optical system comprising:
a refractive type lens; and
a diffractive optical element having a diffraction efficiency more than 0.8 for a wavelength range from 0.4 m to 0.7 m, said diffractive optical element and refractive type lens being arranged along an optical axis of the image pick-up optical system.
42. The camera according to claim 41, wherein said diffractive optical element includes first, second and third optical regions which are arranged successively viewed in a direction of the optical axis, a first relief pattern formed in a first boundary surface between the first and second optical regions, and a second relief pattern formed in a second boundary surface between the second and third optical regions.
43. The camera according to claim 42, wherein a depth d1 of the first relief pattern and a depth d2 of the second relief pattern are smaller than 10 m.
44. The camera according to claim 42, wherein a depth d1 of the first relief pattern is smaller than a depth d2 of the second relief pattern.
45. The camera according to claim 42, wherein an Abbe’s number u1 of the first optical region is larger than an Abbe’s number u3 of the third optical region.
46. The camera according to claim 42, wherein each of said first and second relief patterns is constructed as a blazed grating.
47. The camera according to claim 46, wherein a surface of the first optical region opposed to the surface in which the first relief pattern is formed is curved and a surface of the third optical region opposed to the surface in which the second relief pattern is formed is curved.
48. The camera according to claim 46, wherein each of said first and second relief patterns has a sawtooth cross sectional configuration including sharply raising sides and gently raising sides.
49. The camera according to claim 48, wherein each of said first, second and third optical regions has a substantially constant refractive index.
50. The camera according to claim 49, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
51. The camera according to claim 48, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with top and bottom portions of the second relief pattern, respectively.
52. The camera according to claim 51, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
53. The camera according to claim 51, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
54. The camera according to claim 51, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are extended up to points situating between the bottom portions and the top portions of the second relief pattern viewed in the direction of the optical axis.
55. The camera according to claim 48, wherein said first and second relief patterns have an identical pitch distribution and are aligned in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with bottom and top portions of the second relief pattern, respectively.
56. The camera according to claim 55, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
57. The camera according to claim 55, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
58. The camera according to claim 46, wherein each of said first and second relief patterns has a rectangular cross sectional configuration having top and bottom portions.
59. The camera according to claim 58, wherein each of said first, second and third optical regions has a substantially constant refractive index.
60. The camera according to claim 59, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
61. The camera according to claim 58, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that the top and bottom portions of the first relief pattern are aligned with the bottom and top portions of the second relief pattern, respectively.
62. The camera according to claim 61, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
63. The camera according to claim 61, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
64. A view finder of a camera comprising:
a refractive type lens; and
a diffractive optical element having a diffraction efficiency more than 0.8 for a wavelength range from 0.4 m to 0.7 m, said diffractive optical element and refractive type lens being arranged along an optical axis of the view finder.
65. The view finder according to claim 64, wherein said diffractive optical element includes first, second and third optical regions which are arranged successively viewed in a direction of the optical axis, a first relief pattern formed in a first boundary surface between the first and second optical regions, and a second relief pattern formed in a second boundary surface between the second and third optical regions.
66. The view finder according to claim 65, wherein a depth d1 of the first relief pattern and a depth d2 of the second relief pattern are smaller than 10 m.
67. The view finder according to claim 65, wherein a depth d1 of the first relief pattern is smaller than a depth d2 of the second relief pattern.
68. The view finder according to claim 65, wherein an Abbe’s number u1 of the first optical region is larger than are Abbe’s number u3 of the third optical region.
69. The view finder according to claim 65, wherein each of said first and second relief patterns is constructed as a blazed grating.
70. The view finder according to claim 69, wherein a surface of the first optical region opposed to the surface in which the first relief pattern is formed is curved and a surface of the third optical region opposed to the surface in which the second relief pattern is formed is curved.
71. The view finder according to claim 69, wherein each of said first and second relief patterns has a sawtooth cross sectional configuration including sharply raising sides and gently raising sides.
72. The view finder according to claim 71, wherein each of said first, second and third optical regions has a substantially constant refractive index.
73. The view finder according to claim 72, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
74. The view finder according to claim 71, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with top and bottom portions of the second relief pattern, respectively.
75. The view finder according to claim 74, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
76. The view finder according to claim 74, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
77. The view finder according to claim 74, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are extended up to points situating between the bottom portions and the top portions of the second relief pattern viewed in the direction of the optical axis.
78. The view finder according to claim 71, wherein said first and second relief patterns have an identical pitch distribution and are aligned in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with bottom and top portions of the second relief pattern, respectively.
79. The view finder according to claim 78, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
80. The view finder according to claim 78, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
81. The view finder according to claim 69, wherein each of said first and second relief patterns has a rectangular cross sectional configuration having top and bottom portions.
82. The view finder according to claim 81, wherein each of said first, second and third optical regions has a substantially constant refractive index.
83. The view finder according to claim 82, wherein a refractive index n1 of the first optical region is different from a refractive index n3 of the third optical region and the refractive indices n1 and n3 are larger than a refractive index n2 of the second optical region.
84. The view finder according to claim 81, wherein said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that the top and bottom portions of the first relief pattern are aligned with the bottom and top portions of the second relief pattern, respectively.
85. The view finder according to claim 84, wherein said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
86. The view finder according to claim 84, wherein said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
87. An image pick-up optical system comprising:
a refractive type lens; and
two diffractive optical surfaces, said diffractive optical surfaces and refractive type lens being arranged along an optical axis of the image pick-up optical system and said diffractive optical surfaces being arranged successively viewed in a direction of the optical axis; wherein
each of the diffractive optical surfaces is formed as a relief pattern having a sawtooth cross sectional configuration including sharply raising sides and gently raising sides and having a diffraction efficiency more than 0.8 for a wavelength range from 0.4 m to 0.7 m.
88. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and a depth d1 of the first relief pattern and a depth d2 of the second relief pattern are smaller than 10 m.
89. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and a depth d1 of the first relief pattern is smaller than a depth d2 of the second relief pattern.
90. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and each of said first and second relief patterns is constructed as a blazed grating.
91. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns have an identical pitch distribution and are arranged in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with top and bottom portions of the second relief pattern, respectively.
92. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns are arranged such that a space is formed between the top portions of the first relief pattern and the bottom portions of the second relief pattern viewed in the direction of the optical axis.
93. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.
94. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns are arranged such that the top portions of the first relief pattern are extended up to points situating between the bottom portions and the top portions of the second relief pattern viewed in the direction of the optical axis.
95. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns have an identical pitch distribution and are aligned in a direction of the optical axis such that top and bottom portions of the first relief pattern are aligned with bottom and top portions of the second relief pattern, respectively.
96. The image pick-up optical system according to claim 87, wherein said two diffractive optical surfaces are formed by a first relief pattern and a second relief pattern, and said first and second relief patterns are arranged such that the top portions of the first relief pattern are contacted with the bottom portions of the second relief pattern viewed in the direction of the optical axis.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

What is claimed is:

1. A reversible dual-color floor pad module, comprising a square body being provided along each edge of a first pair of two opposite edges with alternate first dovetails and corresponding dovetail grooves, such that a number of said first dovetails is N, which is a natural number larger than 1, and a number of said dovetail grooves is N1; said square body also being provided along each edge of a second pair of two opposite edges with spaced second dovetails and said first dovetails, and corresponding dovetail grooves between two adjacent ones of said first and said second dovetails and two adjacent ones of said first dovetails, such that a total number of said first dovetails and said second dovetails, and a number of said dovetail grooves at each edge of said second pair of two opposite edges being N1 and N, respectively; and
said second dovetails being always located at four corners of each said square body, and each of said second dovetails being integrally formed from a triangle, a rectangle, and a trapezoid; said triangle being connected at a base to one shorter side of said rectangle, which being then connected at another shorter side to a vertical side of said trapezoid.
2. The reversible dual-color floor pad module as claimed in claim 1, wherein said shorter side of said rectangle connected to the base of said triangle is flush with one of the first pair of two opposite edges that is adjacent to said rectangle, so that said triangle is projected from said adjacent edge, and another side of said trapezoid opposite to said rectangle having an inclination corresponding to that of two sides of said first dovetail.
3. The reversible dual-color floor pad module as claimed in claim 2, wherein said first dovetails formed along each edge of said second pair of two opposite edges of said square body has a shape identical to that of said first dovetails provided along each edge of said first pair of two opposite edges of said square body.
4. The reversible dual-color floor pad module as claimed in claim 2, wherein said dovetail grooves formed on each edge of said second pair of two opposite edges of said square body has a shape inverse to that of said first dovetails provided along each edge of said first pair of two opposite edges of said square body.