CA1148398A - Anti scale device, a security device, and an intruder barrier - Google Patents
Anti scale device, a security device, and an intruder barrierInfo
- Publication number
- CA1148398A CA1148398A CA000408001A CA408001A CA1148398A CA 1148398 A CA1148398 A CA 1148398A CA 000408001 A CA000408001 A CA 000408001A CA 408001 A CA408001 A CA 408001A CA 1148398 A CA1148398 A CA 1148398A
- Authority
- CA
- Canada
- Prior art keywords
- barrier
- intruder
- wall
- blades
- recited
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/003—Anti-climbing devices, e.g. fixed spikes
- E04H17/004—Unstable, e.g. rotatory or resiliently mounted fence panels, spikes
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fencing (AREA)
- Burglar Alarm Systems (AREA)
Abstract
ABSTRACT OF THE INVENTION
An intruder barrier for mounting on the top or side face of a wall is provided. The intruder barrier comprises a scaling barrier formed from a number of blades radially arranged and rotatable about a shaft. Each blade diverges from an apex formed by bending a sheet of material intermediate its ends, and d portion of the material at the apex is cut away to interlock with the apex of another blade or blades to form a hole for reception of the support shaft.
An intruder barrier for mounting on the top or side face of a wall is provided. The intruder barrier comprises a scaling barrier formed from a number of blades radially arranged and rotatable about a shaft. Each blade diverges from an apex formed by bending a sheet of material intermediate its ends, and d portion of the material at the apex is cut away to interlock with the apex of another blade or blades to form a hole for reception of the support shaft.
Description
- 2 -BACKGROUND OF THE INVENTION
_ _ Field of the Invention The present invention relates to an intruder barrier and in particular, to an intruder barrier of the type which is rotatably mounted on the top of a wall whereby a person attempting to pass over the barrier is prevented from obtaining an effective hand-grip on either the wall or barrier.
Description of the prior art _ _ _ _ _ _ _ -- _ _ _ _ _ _ _ In many instances where security devices are required, they are not required to provide an absolute bar to the professional or skilled thief but are more often required to deter vandals or, for example, where there is a likeli-hood of danger, to prevent children and other unauthorised personnel entering a premises. This is particularly the case, for example, in power stations and the like premises where the perimeter walls, fences and portions of the building must be so protected as to prevent children an`d other unauthorised personnel climbing on to or over them.
Thus, there are many cases where the security device is not so much to prevent unauthorised entry of the profess-ional thief as to provide a safety device which will prevent untoward accidents. Needless to say, in the latter cas ,. `:
' :.
_ _ Field of the Invention The present invention relates to an intruder barrier and in particular, to an intruder barrier of the type which is rotatably mounted on the top of a wall whereby a person attempting to pass over the barrier is prevented from obtaining an effective hand-grip on either the wall or barrier.
Description of the prior art _ _ _ _ _ _ _ -- _ _ _ _ _ _ _ In many instances where security devices are required, they are not required to provide an absolute bar to the professional or skilled thief but are more often required to deter vandals or, for example, where there is a likeli-hood of danger, to prevent children and other unauthorised personnel entering a premises. This is particularly the case, for example, in power stations and the like premises where the perimeter walls, fences and portions of the building must be so protected as to prevent children an`d other unauthorised personnel climbing on to or over them.
Thus, there are many cases where the security device is not so much to prevent unauthorised entry of the profess-ional thief as to provide a safety device which will prevent untoward accidents. Needless to say, in the latter cas ,. `:
' :.
- 3 -the security aspect is also important.
Static barriers are well known such as for example, spiked railings, barbed wire or pieces of broken glass embedded in the top of the wall. While some of these methods may restrict the activities of vandals unfortunately, they are not particularly efficient and can be readily easily .
overcome. More importantly they present a considerable safety hazard~
, Further it is known from British Patent Specification No.
.1 612,265 to provide apparatus for preventing or obstructiny the scaling of walls, fences or the like barrier which ~; comprises a substantially cylindrical member constituted ` by a series of rods, bars or sheet material arranged `:;
~ around the perimeteres of a number of co-axial discs to 7 15 produce a cage-like body mounted to rotate on bearing brackets adapted to be secured to the top of a wall or fence. Such devices conslst,~ln thelr slmplest form, ; ~ of a substantially cyl~indrical~ member~mounted in bearings to rota~te on a substantially horizontal axis along a wàll 20 or fence top whereby a person attempting to pass over the barrier is prevented from obtaining an effective handgrip on the wall or barrier which rotates. These devices can be readily easily jammed in one position so :; :
.
- : , 33~3 that it is then only a question of climbing over a stationary barrier. Thus these devices while more suitable than spiked railings, barbed wire or capping members with inserted broken glass are not, unfortunately, as suitable as they could be for the purpose.
In Deutsche ~ffenlegungsschrift 2,206,436 there is described an intruder barrier substantially similar to the intruder barrier of British Patent Specification No. 612,265 except that this intruder barrier is mounted on a support so as to be movable at least partly at right angles to its longitudinal direction. Generally the device is roughly vertically displaceable, however, this intruder barrier is not necessarily any more efficient in use than the simpler constructions of intruder barrier and additionally, is more complex and costly to manu-Facture.
, The term "wall" is used in this specification not only to designate a solid wall such as a conventional perimeter wall but also a wall forming part of a building or any type of fence or railing. Additionally, the term "wall"
includes the sides of any structure such as a tower or structural steel building or support.
.
, The object of the present invention is to provide an improved intruder.barrier of the type hereinbefore described which will be efficient in operation while at the same time relatively inexpensive to manufacture.
A further object of the invention is to provide an intruder barrier which will not constitute a man-trap in use.
A still further object of the invention is to provide an intruder barrier that will be particularly useful for mounting on easy scale perimeter fences, for example, chain link fences.
`
SUMMARY OF THE INVENTION
;: -- ------- _ _ _ According to the invention there is provided an intruder barri`er for mounting on the surface of a wall comprising:
a support shaft having a longitudinal axis; a support frame-work on which the support shaft is mounted, for mountingthe support shaft on the wall with its longitudinal axis substantially parallel to the surface of the wall; and a scaling barrier mounted on the support shaft to be rotatable about sai.d longitudinal axis, said scaling barrier being formed by a plurality of blades substantially equi-spaced circumferentially and radially arranged relative to said ; axis, each blade diverging from an apex formed by bending :
. ~ : . . ~ . - , .
33~a~
a sheet of material intermediate its ends, portions of the material at the apex being cut away to interlock with the apex of another sheet thus forming a hole for reception of the support shaft.
In one embodiment of the invention each sheet forms a pair of blades. Ideally when there are four blades the ; angle of the apex between each pair of blades is approx-imately a right angle.
.
The advantages of the present invention are many and it may be mentioned that the apparatus can be manufactured at a relatively low cost, is simple to erect and generally ; efficient in use. Further the invention does not constitute ! a man-trap or any other device that is likely to cause damage to unauthorised intruders while, at the same time, it prevents children or o~her less skilled personnel from climbing the perimeter wall.
' The intruder barrier according to the present invention is particularly suitable for mounting on easlly scaled peri-- meter fences, for example, a chain-link fence. It provides a more efficient barrier than the more conventional means used, such as, the cranking of the uprights away from the vertical, adjacent the top of the fence to provide an ' ' ' ' ' , ' overhang or the use of barbed wire strands with the attendant dangers to personnel and consequently to the occupier under publ;c liability legislation.
lt should also be noted that a great advantage of the present invention is that it is equally difficult to get out of a premises as it is to get into it and~ therefore, ; it will deter anybody attempting to enter the premises since he or she will be aware that there is no easy exit back over the barrier.
When manufactured of a metal mesh such as weldmesh the metal mesh is almost impossible to climb as the mesh tends to sag and bend under weight while at the same time the edge of the mesh is sufficiently sharp as to cut into a persons hand if any pressure or load is applied and at the same time there is no question of severe injury.
~: : i BRIEF DESCRIPTION OF THE DRAWINGS
____ _____ _____ ___________ ~_ Fig. 1 is an elevational view of an intruder barrier according to the invention mounted on a wall, Fig. 2 is a cross-sectional view in the direction of the arrows V-V of Fig. 1, and - ~
~ .
3g~
Fig. 3 is an exploded view of portion of the intruder barrier of Fig. 1.
DETAILED DESCRIPTION OF THE IN~ENTION :
~ Referring to the drawings, there is illustrated an intruder : 5 barrier mounted on a wall 1. The intruder barrier comprises a scaling barrier, indicated generally by the reference numeral 2, formed by a plurality of blades 3 mounted for rotation on a support shaft 5. The support shaft 5 forms a longitudinal axis for the scaling barrier which is sub-stantially parallel to the surface of the wall 1. A pair of wall-engaging uprights, of which one is shown at 6, form a support framework for the scaling barrier 2. The . blades 3 are of open mesh or net configuration and in ,~: this embodiment are manufactured from expanded metal mesh.
The blades 3 are thus constructed of a semi-rigid material ~: which wi:ll deform under the load of a human intruder but : at the same time is not easily deformable. The exposed : `
edges of each blade 3 forms a relatively sharp cutting edge.
There may be more than one set of blades spaced apart along ~: 20 the support snaft 5. Preferably, the minimum spacing "A"
between the bottom of each blade 3 and the top surface of the wall 1 is of the order of 12 cms while at the same time ~I the spacing between two adjacent blades 3 is so arranged to .
.., - .
: - ~, .- . , , : , ~ , , , .~ , , ., . --~ .
8~
g prevent somebody climbing beneath them and over the wall 1.
In use, the blades 3 deform to some extent and rotate freely under load and this combination presents a formidable barrier to a would-be vandal.
Intruder barriers having such deformable blades form the subject of our co-pend;ng Application No. 320,171.
A pair of blades 3 is formed from the one sheet of material being bent intermediate its ends to form an apex 8 from which the two blades diverge at approximately a right angle. The apices of two pairs of blades 3 interlock to form a hole 9 for reception of the support shaft 5.
It will be appreciated that it is not necessary that the blades be manufactured from an expanded metal mesh material nor indeed is it necessary to manufacture a pair of blades from the one sheet of material. A blade may in fact be formed by bending a sheet of material intermediate its ends and cutting away portion of the material at theapex to interlock with the apex of another blade or blades thus forming a hole for the reception of a support shaft. An important adYantage of a mesh or net like material is that there is no need to cut away portion of the material at ~he apex. The additional advantages of the use of a mesh configuration are firstly, that there is relatively little resistance to air or wind , ~
- l o passage therebetween and thus the blades will not rotate in the wind. Another advantage ofthe use of expanded metal mesh is that in addition to sagging and bend;ng under weight and having sharp edges so as to cut into a persons hand the actual material itself is sufficiently sharp as to make it very difficult to grip or hold. Also it is very difficult to cut expanded metal mesh as it has not got uniform cross-sections such as, for example, conventional wire has. It is, however, preferable that there be at least four blades and in fact that when there are four blades that the angle at the apex between each pair of blades is approximately a right angle.
;' Preferably, the intruder barriers according to the present invention are generally of relatively short length as ,., ~ 15 shown thus further foiling an attempt to lock them for '!
`/~ scaling.
In a particularly suitable construction of intruder barrier in accordance with the invention itis preferable that there be at least four blades each pair of blades being formed from the one sheet of the material. This has the advantage of saving on material. Ideally when there are four blades the angle at the apex between each pair of blades should be approximately a right angle.
.
'' : . , :
: : `
3~3 As mentioned above the material forming each blade may be a semi-rigid material deforming under load. Ideally the material is not readily deformable, that is to say it is not easily deformed under load but at the same time is sufficiently deformable as to make it difficult to jam or otherwise secure in one position.
In accordance with the invention the intruder barrier is so adapted to be secured to the top o-F a wall and in use project beyond one face thereof. Thus, when the intruder barrier projects beyond the face oF the wall it is all the more difficult to climb it.
Further the intruder barrier may be secured to or incorp-orated in a vertical wall and adapted to project beyond that face of the wall. This may be of considerable ; 15 importance where the wall is very high and it would be dangerous if children were to climb to the top of the wall and then fall when trying to climb over an intruder bar ier on the top of the wall.
.
' , ~' ' `,
Static barriers are well known such as for example, spiked railings, barbed wire or pieces of broken glass embedded in the top of the wall. While some of these methods may restrict the activities of vandals unfortunately, they are not particularly efficient and can be readily easily .
overcome. More importantly they present a considerable safety hazard~
, Further it is known from British Patent Specification No.
.1 612,265 to provide apparatus for preventing or obstructiny the scaling of walls, fences or the like barrier which ~; comprises a substantially cylindrical member constituted ` by a series of rods, bars or sheet material arranged `:;
~ around the perimeteres of a number of co-axial discs to 7 15 produce a cage-like body mounted to rotate on bearing brackets adapted to be secured to the top of a wall or fence. Such devices conslst,~ln thelr slmplest form, ; ~ of a substantially cyl~indrical~ member~mounted in bearings to rota~te on a substantially horizontal axis along a wàll 20 or fence top whereby a person attempting to pass over the barrier is prevented from obtaining an effective handgrip on the wall or barrier which rotates. These devices can be readily easily jammed in one position so :; :
.
- : , 33~3 that it is then only a question of climbing over a stationary barrier. Thus these devices while more suitable than spiked railings, barbed wire or capping members with inserted broken glass are not, unfortunately, as suitable as they could be for the purpose.
In Deutsche ~ffenlegungsschrift 2,206,436 there is described an intruder barrier substantially similar to the intruder barrier of British Patent Specification No. 612,265 except that this intruder barrier is mounted on a support so as to be movable at least partly at right angles to its longitudinal direction. Generally the device is roughly vertically displaceable, however, this intruder barrier is not necessarily any more efficient in use than the simpler constructions of intruder barrier and additionally, is more complex and costly to manu-Facture.
, The term "wall" is used in this specification not only to designate a solid wall such as a conventional perimeter wall but also a wall forming part of a building or any type of fence or railing. Additionally, the term "wall"
includes the sides of any structure such as a tower or structural steel building or support.
.
, The object of the present invention is to provide an improved intruder.barrier of the type hereinbefore described which will be efficient in operation while at the same time relatively inexpensive to manufacture.
A further object of the invention is to provide an intruder barrier which will not constitute a man-trap in use.
A still further object of the invention is to provide an intruder barrier that will be particularly useful for mounting on easy scale perimeter fences, for example, chain link fences.
`
SUMMARY OF THE INVENTION
;: -- ------- _ _ _ According to the invention there is provided an intruder barri`er for mounting on the surface of a wall comprising:
a support shaft having a longitudinal axis; a support frame-work on which the support shaft is mounted, for mountingthe support shaft on the wall with its longitudinal axis substantially parallel to the surface of the wall; and a scaling barrier mounted on the support shaft to be rotatable about sai.d longitudinal axis, said scaling barrier being formed by a plurality of blades substantially equi-spaced circumferentially and radially arranged relative to said ; axis, each blade diverging from an apex formed by bending :
. ~ : . . ~ . - , .
33~a~
a sheet of material intermediate its ends, portions of the material at the apex being cut away to interlock with the apex of another sheet thus forming a hole for reception of the support shaft.
In one embodiment of the invention each sheet forms a pair of blades. Ideally when there are four blades the ; angle of the apex between each pair of blades is approx-imately a right angle.
.
The advantages of the present invention are many and it may be mentioned that the apparatus can be manufactured at a relatively low cost, is simple to erect and generally ; efficient in use. Further the invention does not constitute ! a man-trap or any other device that is likely to cause damage to unauthorised intruders while, at the same time, it prevents children or o~her less skilled personnel from climbing the perimeter wall.
' The intruder barrier according to the present invention is particularly suitable for mounting on easlly scaled peri-- meter fences, for example, a chain-link fence. It provides a more efficient barrier than the more conventional means used, such as, the cranking of the uprights away from the vertical, adjacent the top of the fence to provide an ' ' ' ' ' , ' overhang or the use of barbed wire strands with the attendant dangers to personnel and consequently to the occupier under publ;c liability legislation.
lt should also be noted that a great advantage of the present invention is that it is equally difficult to get out of a premises as it is to get into it and~ therefore, ; it will deter anybody attempting to enter the premises since he or she will be aware that there is no easy exit back over the barrier.
When manufactured of a metal mesh such as weldmesh the metal mesh is almost impossible to climb as the mesh tends to sag and bend under weight while at the same time the edge of the mesh is sufficiently sharp as to cut into a persons hand if any pressure or load is applied and at the same time there is no question of severe injury.
~: : i BRIEF DESCRIPTION OF THE DRAWINGS
____ _____ _____ ___________ ~_ Fig. 1 is an elevational view of an intruder barrier according to the invention mounted on a wall, Fig. 2 is a cross-sectional view in the direction of the arrows V-V of Fig. 1, and - ~
~ .
3g~
Fig. 3 is an exploded view of portion of the intruder barrier of Fig. 1.
DETAILED DESCRIPTION OF THE IN~ENTION :
~ Referring to the drawings, there is illustrated an intruder : 5 barrier mounted on a wall 1. The intruder barrier comprises a scaling barrier, indicated generally by the reference numeral 2, formed by a plurality of blades 3 mounted for rotation on a support shaft 5. The support shaft 5 forms a longitudinal axis for the scaling barrier which is sub-stantially parallel to the surface of the wall 1. A pair of wall-engaging uprights, of which one is shown at 6, form a support framework for the scaling barrier 2. The . blades 3 are of open mesh or net configuration and in ,~: this embodiment are manufactured from expanded metal mesh.
The blades 3 are thus constructed of a semi-rigid material ~: which wi:ll deform under the load of a human intruder but : at the same time is not easily deformable. The exposed : `
edges of each blade 3 forms a relatively sharp cutting edge.
There may be more than one set of blades spaced apart along ~: 20 the support snaft 5. Preferably, the minimum spacing "A"
between the bottom of each blade 3 and the top surface of the wall 1 is of the order of 12 cms while at the same time ~I the spacing between two adjacent blades 3 is so arranged to .
.., - .
: - ~, .- . , , : , ~ , , , .~ , , ., . --~ .
8~
g prevent somebody climbing beneath them and over the wall 1.
In use, the blades 3 deform to some extent and rotate freely under load and this combination presents a formidable barrier to a would-be vandal.
Intruder barriers having such deformable blades form the subject of our co-pend;ng Application No. 320,171.
A pair of blades 3 is formed from the one sheet of material being bent intermediate its ends to form an apex 8 from which the two blades diverge at approximately a right angle. The apices of two pairs of blades 3 interlock to form a hole 9 for reception of the support shaft 5.
It will be appreciated that it is not necessary that the blades be manufactured from an expanded metal mesh material nor indeed is it necessary to manufacture a pair of blades from the one sheet of material. A blade may in fact be formed by bending a sheet of material intermediate its ends and cutting away portion of the material at theapex to interlock with the apex of another blade or blades thus forming a hole for the reception of a support shaft. An important adYantage of a mesh or net like material is that there is no need to cut away portion of the material at ~he apex. The additional advantages of the use of a mesh configuration are firstly, that there is relatively little resistance to air or wind , ~
- l o passage therebetween and thus the blades will not rotate in the wind. Another advantage ofthe use of expanded metal mesh is that in addition to sagging and bend;ng under weight and having sharp edges so as to cut into a persons hand the actual material itself is sufficiently sharp as to make it very difficult to grip or hold. Also it is very difficult to cut expanded metal mesh as it has not got uniform cross-sections such as, for example, conventional wire has. It is, however, preferable that there be at least four blades and in fact that when there are four blades that the angle at the apex between each pair of blades is approximately a right angle.
;' Preferably, the intruder barriers according to the present invention are generally of relatively short length as ,., ~ 15 shown thus further foiling an attempt to lock them for '!
`/~ scaling.
In a particularly suitable construction of intruder barrier in accordance with the invention itis preferable that there be at least four blades each pair of blades being formed from the one sheet of the material. This has the advantage of saving on material. Ideally when there are four blades the angle at the apex between each pair of blades should be approximately a right angle.
.
'' : . , :
: : `
3~3 As mentioned above the material forming each blade may be a semi-rigid material deforming under load. Ideally the material is not readily deformable, that is to say it is not easily deformed under load but at the same time is sufficiently deformable as to make it difficult to jam or otherwise secure in one position.
In accordance with the invention the intruder barrier is so adapted to be secured to the top o-F a wall and in use project beyond one face thereof. Thus, when the intruder barrier projects beyond the face oF the wall it is all the more difficult to climb it.
Further the intruder barrier may be secured to or incorp-orated in a vertical wall and adapted to project beyond that face of the wall. This may be of considerable ; 15 importance where the wall is very high and it would be dangerous if children were to climb to the top of the wall and then fall when trying to climb over an intruder bar ier on the top of the wall.
.
' , ~' ' `,
Claims (10)
1. An intruder barrier for mounting on a surface of a wall comprising: a support shaft having a longitudinal axis;
a support framework on which the support shaft is mounted, for mounting the support shaft on the wall with its longitudinal axis substantially parallel to the surface of the wall; and a scaling barrier mounted on the support shaft to be rotatable about said longitudinal axis, said scaling barrier being formed by a plurality of blades substantially equi-spaced circumferentially and radially arranged relative to said axis, each blade diverging from an apex formed by bending a sheet of material intermediate its ends, portions of the material at the apex being cut away to interlock with the apex of another sheet thus forming a hole for reception of the support shaft.
a support framework on which the support shaft is mounted, for mounting the support shaft on the wall with its longitudinal axis substantially parallel to the surface of the wall; and a scaling barrier mounted on the support shaft to be rotatable about said longitudinal axis, said scaling barrier being formed by a plurality of blades substantially equi-spaced circumferentially and radially arranged relative to said axis, each blade diverging from an apex formed by bending a sheet of material intermediate its ends, portions of the material at the apex being cut away to interlock with the apex of another sheet thus forming a hole for reception of the support shaft.
2. An intruder barrier as recited in claim 1 in which each sheet forms a pair of blades.
3. An intruder barrier as recited in claim 1 in which there are four blades and the angle of the apex between each pair of blades is approximately a right angle.
4. An intruder barrier as recited in claim 1 in which the exposed edges of each blade form sharp cutting edges.
5. An intruder barrier as recited in claim 1 in which the support shaft is mounted between a pair of wall-engaging uprights forming the support framework.
6. An intruder barrier as recited in claim 1 in which there is more than one set of longitudinally spaced blades on the support shaft.
7. An intruder barrier as recited in claim 1 in which the barrier is adapted to be secured to the top of the wall and, in use, project beyond one vertical face thereof.
8. An intruder barrier as recited in claim 1 in which the barrier is adapted to be secured to or incorporated in a vertical wall below the top thereof.
9. An intruder barrier as recited in claim 8 wherein, in use, the barrier projects beyond the vertical face of the wall.
10. An intruder barrier as recited in any of claims 1 to 3 in which the blades are of expanded metal mesh material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000408001A CA1148398A (en) | 1978-01-22 | 1982-07-23 | Anti scale device, a security device, and an intruder barrier |
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE780162A IE45514L (en) | 1978-01-22 | 1978-01-22 | Intruder barrier |
| IE162/78 | 1978-01-25 | ||
| IE1388/78 | 1978-07-11 | ||
| IE138878 | 1978-07-11 | ||
| IE229678 | 1978-11-22 | ||
| IE2296/78 | 1978-11-22 | ||
| CA000320171A CA1148397A (en) | 1978-01-22 | 1979-01-24 | Anti scale device, a security device, and an intruder barrier |
| CA000408001A CA1148398A (en) | 1978-01-22 | 1982-07-23 | Anti scale device, a security device, and an intruder barrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148398A true CA1148398A (en) | 1983-06-21 |
Family
ID=27508133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000408001A Expired CA1148398A (en) | 1978-01-22 | 1982-07-23 | Anti scale device, a security device, and an intruder barrier |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1148398A (en) |
-
1982
- 1982-07-23 CA CA000408001A patent/CA1148398A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |