All The Claims

1. Redetachable, self-adhesive device having a plate, the sides andor front side of which have fastening means, if appropriate, and the rear side of which has a strip of an adhesive film which is adhesive on both sides and is adhesively attached in such a way that one end of the adhesive film protrudes beyond the plate as a grip, the adhesive film being of such a kind that the adhesive bond achieved with it can be released again by pulling in the direction of the bonding plane, stretching the strip, characterized in that the rear side of the plate (1) has laterally alongside the adhesively attached adhesive film (5) spacers (3A, 3B), the height of which is less than the thickness of the adhesive film (5).
2. Device according to claim 1, characterized in that the spacers (3A, 3B) are located on both sides alongside the adhesively attached adhesive film (5).
3. Device according to claim 1, characterized in that the spacers (3A, 3B) are formed as fillets or segments.
4. Device according to claim 1, characterized in that the spacers (3A, 3B) are arranged on both sides and, on each of these sides, at least in the region of the two ends.
5. Device according to claim 1, characterized in that it is formed as an injection-moulded part of plastic.
6. Device according to claim 1, characterized in that the height of the spacers (3A, 3B) is 35-90% of the thickness of the adhesive film (5), in particular is 0.3-0.6 mm with a thickness of the adhesive film (5) of 0.65 mm.
7. Device according to claim 1, characterized in that the adhesive film (5), with or without an intermediate substrate, is elastically or plastically extensible.
8. Device according to claim 1, characterized in that the adhesion of the adhesive film (5) is less than the cohesion, the adhesiveness is to a great extent dissipated when the film is extended, and the ratio of pulling-off force to tearing load is at least 1:1.5, the adhesive film being of the kind which is based on thermoplastic rubber and tackifying resins, with high elasticity and low plasticity.
9. Device according to claim 1, characterized in that the rear side of the adhesive film (5) is covered with a release laminate, such as a siliconized release paper or a release film.
10. Device according to claim 1, characterized in that at the sides of the plate (1) there are engagement devices (4) into which a corresponding hook or the like can be engaged.
11. Device according to claim 1, characterized in that a spacer is arranged at one of the end faces on the rear side of the plate (1) alongside the adhesively attached adhesive film (5).
12. Use of a plate for a device according to one of claims 1-11, for self-adhesive fastening and easy, residue-free redetachment.

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.-20. (canceled)
21. A support apparatus comprising at least first and second legs, wherein the support apparatus is provided with levelling means comprising:
at a lower end of each of the first and second legs a cylinder and piston unit, wherein movement of the pistons of the cylinder and piston units relative to the cylinders permits variation in the length of each of the first and second legs;
fluid communication means for establishing at least one closed fluid passageway between the cylinder and piston units; and
valve means for controlling the passage of fluid through the fluid communication means,
wherein in a first position, the valve means permit fluid to flow between the cylinder and piston units via the fluid communication means such that the length of each of the legs is accommodated to the profile of the ground, and wherein in a second position, the valve means do not permit fluid to flow between the cylinder and piston units thereby locking the cylinder and piston units in position.
22. The support apparatus of claim 21, further comprising actuating means for selectively moving the valve means between said first and second positions.
23. The support apparatus of claim 21, wherein the cylinder and piston units are dual acting hydraulic cylinder and piston units, each comprising upper and lower working chambers and wherein the upper and lower working chambers of the cylinder and piston unit on the first leg are separately in fluid communication with the corresponding upper and lower working chambers of the cylinder and piston unit on the second leg.
24. The support apparatus of claim 23, wherein the actuating means simultaneously control fluid communication between the upper and lower working chambers of the cylinder and piston units.
25. The support apparatus of claim 24, wherein the actuating means is substantially perpendicular to the legs of the support apparatus when the valve means are in said first position and substantially parallel to the legs of the support apparatus when the valve means are in said second position.
26. The support apparatus of claim 21, wherein at least the first and second legs are provided with stabilizing means.
27. The support apparatus of claim 26, wherein the stabilizing means comprise a stabilizer bar attached to both the first and second leg.
28. The support apparatus of claim 26, wherein the stabilizing means comprises separate stabilizer members attached to the first leg and the second leg.
29. The support apparatus of claim 28, wherein the stabilizer members are pivotably attached to the lower ends of the first and second legs, such that a first end of each stabilizer member contacts the ground and a second end of each stabilizer member is connected to one of the cylinder and piston units, thereby permitting variation in the length of each leg to be effected by controlling the degree of rotation of each stabilizer member about the respective pivot point on each leg.
30. The support apparatus of claim 21, wherein the support apparatus is selected from the group consisting of a ladder, a step ladder, and a scaffold frame.
31. The support apparatus of claim 30, wherein the support apparatus is a ladder.
32. The support apparatus of claim 31, wherein an upper part of the ladder is provided with at least one wheel or continuous track.
33. The support apparatus of claim 30, wherein the support apparatus is a step ladder or a scaffold frame.
34. The support apparatus of claim 33, wherein at least a third and fourth leg is provided with:
a cylinder and piston unit, wherein movement of the pistons of the cylinder and piston units relative to the cylinders permits variation in the length of each of the third and fourth legs;
fluid communication means for establishing at least one closed fluid passageway between the cylinder and piston units; and
valve means for controlling the passage of fluid through the fluid communication means,
wherein in a first position, the valve means permit fluid to flow between the cylinder and piston units via the fluid communication means such that the length of each of the legs is accommodated to the profile of the ground, and wherein in a second position, the valve means do not permit fluid to flow between the cylinder and piston units thereby locking the cylinder and piston units in position.
35. The support apparatus of claim 34, wherein the cylinder and piston units on the first and second legs are in fluid communication with each other and the cylinder and piston units on the third and fourth legs are independently in fluid communication with each other.
36. A kit for adapting a support apparatus comprising: \u2014
at least one pair of cylinder and piston units;
fluid communication means for establishing at least one closed fluid passageway between the cylinder and piston units; and
valve means for controlling the passage of fluid through the fluid communication means,
wherein in a first position, the valve means permit fluid to flow between the cylinder and piston units via the fluid communication means such that the pistons can move relative to the cylinders of the cylinder and piston units, and wherein in a second position, the valve means do not permit fluid to flow between the cylinder and piston units thereby locking the cylinder and piston units in position.
37. The kit of claim 36, further comprising actuating means for selectively moving the valve means between said first and second positions.
38. The kit of claim 36, wherein the cylinder and piston units are dual acting hydraulic cylinder and piston units, each comprising upper and lower working chambers and wherein the upper and lower working chambers of a first cylinder and piston unit are separately in fluid communication with the corresponding upper and lower working chambers of a second cylinder and piston unit.
39. The kit of claim 36, further comprising fixing means for attaching the cylinder and piston units to at least first and second legs of a support apparatus.

1. A method of investigating a subterranean wellbore comprising:
a. providing a downhole tool having a radiation source;
b. disposing the downhole tool in the subterranean wellbore;
c. directing radiation from the source into an annulus between the downhole tool and a wall of the subterranean wellbore so that the radiation scatters back to a detector on the downhole tool;
d. detecting radiation that single scattered back into the detector from the annulus;
e. identifying a material in the annulus based on a count rate of detected radiation; and
f. repeating steps (a)-(c) at a different depth in the wellbore and where a thickness of the annulus varies around a circumference of the annulus, so that a detectable amount of energy of the at least some of the radiation is attenuated within an outer tubular that circumscribes the annulus.
2. The method of claim 1, wherein the radiation comprises a gamma ray from a gamma ray source having an energy of from about 250 keV to about 700 keV and wherein the scattered radiation when detected has an energy of from about 50 keV to about 350 keV.
3. The method of claim 1, wherein the radiation comprise a first set of radiation and the path comprises a first path, the method further comprising:
directing a second set of radiation along a second path having an azimuthal component that is substantially 180\xb0 from an azimuthal component of the first path so that at least some of the second set of radiation scatter from fluid disposed in the tubular, and detecting the scattered second set of radiation, wherein the step of identifying a material in the annulus is further based on a rate of detection of the second set of radiation.
4. The method of claim 3, further comprising:
detecting a fluid in the annulus when a ratio of the rate of detection of the first set of radiation over the rate of detection of the second set of radiation reduces when the thickness reduces.
5. The method of claim 4, further comprising detecting a substantially solid material in the annulus when a ratio of the rate of detection of the first set of radiation over the rate of detection of the second set of radiation remains substantially the same with changes in the thickness.
6. The method of claim 1, wherein the count rate of detected radiation increases with increasing density of material in the annulus.
7. The method of claim 1, wherein the annulus is adjacent a tubular disposed in the subterranean wellbore.
8. A method of interrogating an annulus between an inner tubular and an outer tubular that are parallel and disposed in a subterranean wellbore, the method comprising:
a. providing a gamma ray source disposed in a logging instrument against an azimuthal section of the inner tubular;
b. using a collimator in the logging instrument to direct gamma rays from the source so that some of the gamma rays travel through the sidewall of the logging instrument, into the annulus and single scatter from a material in the annulus back into the inner tubular, and so that some of the gamma rays travel away from the azimuthal section of the logging instrument and single scatter from a fluid in the inner tubular;
c. detecting the single scattered gamma rays and classifying gamma rays that single scatter from the fluid in the inner tubular and those that single scatter from the material in the annulus; and
d. estimating a density of the material in the annulus based on a count rate of detection of the scattered gamma rays, wherein a rate of detection of gamma rays deflecting from fluid in the wellbore is used as a reference for determining the material in the annulus.
9. The method of claim 8, wherein a conically shaped guide is provided proximate the gamma ray source and positioned in the logging instrument so that an apex of the guide is directed towards the source and the guide has an axis that is substantially parallel with an axis of the inner tubular.
10. The method of claim 8, wherein a detector is disposed from about 2 inches to about 4 inches from the gamma ray source and wherein the detector is used to detect the single scattered gamma rays.
11. The method of claim 8, wherein a collimator is used to strategically direct the gamma rays away from the source at an angle oblique to an axis of the inner tubular and along discrete paths disposed azimuthally around the gamma ray source, so that strategically located detectors respectively detect scattering from discrete azimuthal areas spaced radially outward from the gamma ray source.
12. The method of claim 8, further comprising repeating steps (a)-(d) at different depths in a section of the wellbore and identifying a substantially solid material in the annulus when a ratio of a rate of gamma rays detected that are scattered from the annulus over a rate of gamma rays detected that are scattered from the fluid in the inner tubular remains substantially the same with changes in thickness of the annulus.
13. The method of claim 8, further comprising repeating steps (a)-(d) at different depths in a section of the wellbore and identifying a substantially liquid material in the annulus when a ratio of a rate of gamma rays detected that are scattered from the annulus over a rate of gamma rays detected that are scattered from the fluid in the inner tubular is reduced with a reduction in thickness of the annulus.
14. A method of analyzing an annulus between an inner tubular and an outer tubular that are parallel and disposed in a subterranean wellbore, the method comprising:
a. providing a gamma ray source disposed in a logging instrument against an azimuthal section of the inner tubular;
b. directing gamma rays from the source so that some of the gamma rays travel into the annulus and scatter from a material in the annulus back into the inner tubular, and so that some of the gamma rays travel away from the azimuthal section and scatter from a fluid in the inner tubular;
c. detecting the scattered gamma rays and classifying gamma rays that scatter from the fluid in the inner tubular and those that scatter from the material in the annulus;
d. identifying the material in the annulus based on a rate of detection of the scattered gamma rays; and
e. repeating steps (a)-(d) at different depths in a section of the wellbore,
identifying a substantially solid material in the annulus when a ratio of a rate of gamma rays detected that are scattered from the annulus over a rate of gamma rays detected that are scattered from the fluid in the inner tubular remains substantially the same with changes in thickness of the annulus, and
identifying a substantially liquid material in the annulus when a ratio of a rate of gamma rays detected that are scattered from the annulus over a rate of gamma rays detected that are scattered from the fluid in the inner tubular is reduced with a reduction in thickness of the annulus.
15. The method of claim 14, further comprising repeating step (e) along sections of the wellbore that are at different depths.
16. The method of claim 14, wherein the rate of gamma rays that are scattered from the fluid in the tubular comprises a reference value for use in identifying a liquid in the annulus.
17. A method of interrogating an annulus between an inner tubular and an outer tubular that parallel and are disposed in a subterranean wellbore, the method comprising:
a. providing a gamma ray source disposed in a logging instrument against an azimuthal section of the inner tubular;
b. using a collimator in the logging instrument to direct gamma rays from the source so that some of the gamma rays travel through the sidewall of the logging instrument, into the annulus and single scatter from a material in the annulus back into the inner tubular, and so that some of the gamma rays travel away from the azimuthal section of the logging instrument and single scatter from a fluid in the inner tubular;
c. detecting the single scattered gamma rays and classifying gamma rays that single scatter from the fluid in the inner tubular and those that single scatter from the material in the annulus;
d. estimating a density of the material in the annulus based on a count rate of detection of the scattered gamma rays; and
e. repeating steps (a)-(d) at different depths in a section of the wellbore and identifying a material in the annulus when a ratio of a rate of gamma rays detected that are scattered from the annulus over a rate of gamma rays detected that are scattered from the fluid in the inner tubular, the material being identified as substantially solid when the ratio of a rate of gamma rays detected remains substantially the same with changes in thickness of the annulus, and the material being identified as substantially liquid when the ratio of a rate of gamma rays detected is reduced with a reduction in thickness of the annulus.
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 exchange-coupled film in which an antiferromagnetic layer and a ferromagnetic layer sandwich are stacked and in which a direction of magnetization of the ferromagnetic layer sandwich is pinned,
wherein said ferromagnetic layer sandwich comprises a first ferromagnetic layer containing a ferromagnetic material of the body-centered cubic structure, and a pair of second ferromagnetic layers containing a ferromagnetic material of the face-centered cubic structure and formed on respective sides of the first ferromagnetic layer, and
wherein said antiferromagnetic layer contains a disordered alloy chosen from the group consisting of IrMn alloys, RuRhMn alloys, FeMn alloys and RuMn alloys, and said antiferromagnetic layer is kept in contact with one of said second ferromagnetic layers, and
wherein said antiferromagnetic layer has a thickness of 10 nm less and
wherein said exchange-coupled film yields a high exchange coupling energy Jk of not less than 263 \u03bcJm2.
2. The exchange-coupled film according to claim 1, wherein the ferromagnetic layer sandwich further comprises a third ferromagnetic layer placed through a nonmagnetic intermediate layer on the opposite side to the antiferromagnetic layer with the other second ferromagnetic layer in between.
3. A spin valve film comprising the exchange-coupled film as set forth in claim 1; a nonmagnetic, conductive layer laid on the ferromagnetic layer sandwich of the exchange-coupled film; and a free layer laid on the nonmagnetic, conductive layer and containing a ferromagnetic material.
4. A thin film magnetic head comprising the spin valve film as set forth in claim 3, and a pair of magnetic shield layers placed at positions where the spin valve film is sandwiched therebetween from both sides in a stack direction of the spin valve film, and containing a soft magnetic material.
5. The thin film magnetic head according to claim 4, comprising a pair of electrode layers electrically connected to the spin valve film and adapted for allowing an electric current to flow parallel to a film surface of the spin valve film.
6. The thin film magnetic head according to claim 4, comprising a pair of electrode layers electrically connected to the spin valve film and adapted for allowing an electric current to flow perpendicular to a film surface of the spin valve film.
7. A magnetic head apparatus comprising the thin film magnetic head as set forth in claim 4; and a head supporting device for supporting the thin film magnetic head.
8. A magnetic recordingreproducing apparatus comprising the magnetic head apparatus as set forth in claim 7; and a magnetic recording medium for implementing magnetic recordingreproduction in collaboration with the thin film magnetic head of the magnetic head apparatus.
9. The exchange-coupled film according to claim 1, wherein said antiferromagnetic layer has a thickness in the range of 5 to 10 nm.