EP0152881A2 - Security door assembly - Google Patents
Security door assembly Download PDFInfo
- Publication number
- EP0152881A2 EP0152881A2 EP85101347A EP85101347A EP0152881A2 EP 0152881 A2 EP0152881 A2 EP 0152881A2 EP 85101347 A EP85101347 A EP 85101347A EP 85101347 A EP85101347 A EP 85101347A EP 0152881 A2 EP0152881 A2 EP 0152881A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- timber
- rearward
- layer
- structure according
- 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.)
- Granted
Links
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/12—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against air pressure, explosion, or gas
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
- E05G1/00—Safes or strong-rooms for valuables
- E05G1/02—Details
- E05G1/024—Wall or panel structure
Definitions
- the present invention relates to security barrier structures and aims in particular to provide a structure having a high degree of resistance to penetration by the action of explosive charges applied to the outer surface of the structure.
- Barriers in accordance with the invention are intended especially for use in the construction of doors for buildings or other structures which are liable to come under explosive attack at the hands of burglars or saboteurs for example, although they may also find utilisation in the walls or other fixed boundaries of such structures.
- the prior art provides many barrier structures intended for use in, for example, the doors of bank vaults and the like security enclosures, which are designed to provide a high degree of resistance to penetration with drills, punches, flame-cutting equipment and other mechanical and thermal tools commonly appropriated by burglars.
- the materials and modes of construction employed in these structures are not well suited to resist the effects of high-explosive surface charges of even modest proportions. It is to the provision of structures providing protection from this kind of attack that the invention is principally directed, it being recognised that there is currently a demand for the protection of various kinds of building from explosive attacks which may be mounted not with burglarious intent but with the aim simply of causing damage to the structure and its contents or occupants.
- the purpose of the aforesaid timber layer is to act as a shock absorber to protect the structure behind it from blast effects and also as a thermal insulator to reduce the transmission of heat to the structure behind it, so that the rearward portion of the structure can be protected from the influence of an explosion occuring at or near to the exposed surface of the structure, and retain its integrity as a physical barrier notwithstanding the partial destruction or breaching of the portions of the structure in front of it.
- the blast pressure effects resulting from the explosion are dispersed in air space 6 over a large area of the timber layer 5, thereby to avoid or minimise a concentration of pressure on a relatively small area of the timber. If a sufficient pressure force is exerted on the inner face of front plate 2 in the direction of arrow X in Figures 1 and 2, the rivets 3 will give to permit front plate 2 to be blown off the frame 1, thereby further to dissipate the blast and minimise its destructive effect on the timber layer 5.
- Timber layer 5 confers resistance to an explosive attack upon the door by acting to absorb physical shock and to reduce the transmission of heat through the door to the steel back plate 4 behind it.
- the door A is hinged at 7 to an associated door frame B and can be provided with a suitable fastening mechanism comprising, for example, bolts (not shown) to be thrown into the frame B through the opening side edge of the door in response to manipulation of an external handle 8, together with fixed stud bolts 9 on the hinge side edge of the door.
- a suitable fastening mechanism comprising, for example, bolts (not shown) to be thrown into the frame B through the opening side edge of the door in response to manipulation of an external handle 8, together with fixed stud bolts 9 on the hinge side edge of the door.
- a test door was constructed generally in accordance with Figures 1 to 3 hereof and having the following characteristics: plate 2 was 3mm thick mild steel; plate 4 was 10mm thick mild steel; the frame sections 1 were 50mm square, 2.5mm wall thickness steel tube; the internal space between the plates 2 and 4 was 50mm deep; and the timber layer 5 comprised 40mm thick maranti boards.
- This specimen was mounted in a typical frame and a limpet mine having a charge of 0.95kg of Tritanol explosive was applied to the surface of plate 2. When the charge was detonated the plate 2 was blown off and the timber 5 fell out, but the plate 4 attached to sections 1 remained intact and bolted to its frame, with some plastic deformation, so that the brrier as a whole was not breached.
- Figures 5 and 6 show a barrier structure for incorporation into a blast-resistant door which may withstand rather heavier charges than those of Figures 1 to 4 and which, in the illustrated embodiment, is designed also to be fire resistant.
- the barrier comprises essentially a double box-like structure.
- One "box" is composed of a steel plate 11 - which provides the outer face of the structure - attached to an intermediate steel plate 12 via framing sections 13, and stiffened by horizontal angles 14.
- the other "box” is compsed of a steel back plate 15 welded to the plate 12 via framing sections 16 and horizontal stringers 17.
- Within the first of these compartments there is a layer of timber 18 fronted by a layer of kieselguhr (diatomaceous earth) 19.
- the rearward compartment between plates 12 and 15 will house a driving and locking mechanism (not shown) to throw door bolts into an associated frame, or alternatively the door may be locked by bolts thrown into engagement with sockets in the door (at the positions indicated at 20 in Figure 1) from a mechanism housed in the associated frame.
- a driving and locking mechanism (not shown) to throw door bolts into an associated frame, or alternatively the door may be locked by bolts thrown into engagement with sockets in the door (at the positions indicated at 20 in Figure 1) from a mechanism housed in the associated frame.
- the purpose of the timber layer 8 in this structure is, as before, to confer resistance to an explosive attack upon the door by acting to absorb physical shock and to reduce the transmission of heat through the door to the steel behind it. To demonstrate the efficacy of this type of structure the following test was conducted.
- a test specimen was constructed substantially in accordance with Figures 5 and 6 hereof and having the following characteristics: the overall thickness of the structure was 273mm; plate 11 was 3mm thick mild steel; plate 12 was 20mm thick mild steel: plate 15 was 10mm thick mild steel; the timber layer 18 was composed of 40mm thick maranti planks; and the kieselguhr layer 19 was 100mm thick.
- the specimen was supported in a rig to simulate its mounting to the associated door frame and a 3.33kg charge of type PE4 (cyclonite-based) plastic explosive (equivalent to about 5kg of dynamite) was applied to the surface of plate 11.
- type PE4 cyclonite-based plastic explosive
- the kieselguhr layer 19 is provided to confer general fire resistance to the structure, and is not thought to make a significant contribution to blast resistance of itself. By replacing the layer 19 in this structure with further timber, therefore, resistance to even heavier charges of explosive may be obtained.
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Special Wing (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Description
- The present invention relates to security barrier structures and aims in particular to provide a structure having a high degree of resistance to penetration by the action of explosive charges applied to the outer surface of the structure. Barriers in accordance with the invention are intended especially for use in the construction of doors for buildings or other structures which are liable to come under explosive attack at the hands of burglars or saboteurs for example, although they may also find utilisation in the walls or other fixed boundaries of such structures.
- The prior art provides many barrier structures intended for use in, for example, the doors of bank vaults and the like security enclosures, which are designed to provide a high degree of resistance to penetration with drills, punches, flame-cutting equipment and other mechanical and thermal tools commonly appropriated by burglars. Generally speaking, however, the materials and modes of construction employed in these structures are not well suited to resist the effects of high-explosive surface charges of even modest proportions. It is to the provision of structures providing protection from this kind of attack that the invention is principally directed, it being recognised that there is currently a demand for the protection of various kinds of building from explosive attacks which may be mounted not with burglarious intent but with the aim simply of causing damage to the structure and its contents or occupants. Any such structure clearly must be designed to withstand the physical shock of the blast. Furthermore, we believe that another significant factor contributing to the potential damage of a structure when an explosive charge is detonated at or near its surface is the near-instantaneous release of thermal energy in the explosion, which is not only per se destructive to material within its influence but also exacerbates the blast pressure effects.
- Consequently, we believe that successfully to resist attacks of the nature indicated above a structure should be designed to withstand both the mechanical and thermal effects of an explosion, and one material which we have found to be of utility in such a structure both from the point of view of shock absorption and resistance to the transmission of heat is timber. Accordingly the present invention proposes an explosion-resistant barrier structure comprising a rearward portion adapted to provide a physical barrier between the two sides of the structure; a forward portion spaced from the rearward portion and providing the exposed face of the structure; and a layer of timber located between said forward and rearward portions and adapted to protect said rearward portion from the effects of an explosive charge detonated at or near to said exposed surface.
- The purpose of the aforesaid timber layer is to act as a shock absorber to protect the structure behind it from blast effects and also as a thermal insulator to reduce the transmission of heat to the structure behind it, so that the rearward portion of the structure can be protected from the influence of an explosion occuring at or near to the exposed surface of the structure, and retain its integrity as a physical barrier notwithstanding the partial destruction or breaching of the portions of the structure in front of it.
- In structures according to the invention provided for thief- resisting applications, eg in bank vaults and the like, the aforesaid rearward portion of the structure will be constructed with materials chosen for resistance to penetration by the different kinds of tools likely to be found in the thieves' armoury. However, this is not an essential feature-of the invention and in other applications, where a high degree of resistance to attack with tools other than explosives is not necessarily required, the rearward portion may be of relatively simple construction sufficient for the purpose of providing a chosen degree of separation between the two sides of the structure (presupposing that the forward and intermediate portions might be breached by an explosive attack).
- ) In general, the forward portion of the structure need comprise little more than an outer finishing layer of the structure, eg a steel sheet, although in some embodiments this area of the structure may be developed to still further enhance resistance ) to explosive attacks or for other special purposes. It is desirable for this forward portion to be suitably mounted, such as by means of rivets, to enable it to become detached from the remainder of the structure relatively easily under the influence of an outward force exerted on the forward portion. With this arrangement, the forward portion may become detached under the influence of the blast pressure transmitted to the interior of the structure if the forward portion is breached by an explosion at or near its exposed surface. This detachment of the forward portion serves to dissipate the effects of the explosion and to allow the blast to be spread over a larger area of the timber layer than might be the case if the forward portion remained rigidly secured to the rest of the structure. The timber layer is therefore protected from a concentration of the blast in a relatively small area and may thus be better able to absorb its effects.
- The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
- Figures 1 and 2 are respectively horizontal and vertical sections through one embodiment of a blast-resistant door made in accordance with the present invention; j
- Figure 3 is a front view on the outer face of the door of Figures 1 and 2;
- Figure 4 is a vertical section through another embodiment of a blast-resistant door made in accordance with the invention; and
- Figures 5 and 6 are respectively horizontal and vertical sections through a further embodiment of a barrier structure according to the invention for incorporation in a blast-resistant door.
- Referring first to Figures 1 to 3, the door A comprises an
internal frame 1 fabricated from tubular steel sections.Steel front plate 2 is mounted onframe 1 on one side thereof by means ofrivets 3 in a manner to permitfront plate 2 to become detached relatively easily fromframe 1 by outward force exerted in the direction of arrow X on the inner surface 2a offront plate 2.Front plate 2 provides the outer, exposed face of the door.Steel back plate 4 is welded toframe 1 on the side opposite tofront plate 2 to-provide a compartment betweenfront plate 2 andback plate 4. A layer oftimber 5 is disposed in this compartment betweenfront plate 2 andback plate 4. It will be seen thatfront plate 2 is stood-off some distance from the intermediate layer oftimber 5 to provide anair space 6 betweenfront plate 2 and thetimber 5. - If the
front plate 2 is penetrated when an explosive charge is detonated at or near its outer face, the blast pressure effects resulting from the explosion are dispersed inair space 6 over a large area of thetimber layer 5, thereby to avoid or minimise a concentration of pressure on a relatively small area of the timber. If a sufficient pressure force is exerted on the inner face offront plate 2 in the direction of arrow X in Figures 1 and 2, therivets 3 will give to permitfront plate 2 to be blown off theframe 1, thereby further to dissipate the blast and minimise its destructive effect on thetimber layer 5. -
Timber layer 5 confers resistance to an explosive attack upon the door by acting to absorb physical shock and to reduce the transmission of heat through the door to thesteel back plate 4 behind it. - It is not essential to provide an
air space 6 betweenfront plate 2 andintermediate timber layer 5. As shown in Figure 4, two superimposed layers oftimber 5a and 5b may be disposed betweenfront plate 2 andback plate 4 in substantially abutting relationship therewith. - The door A is hinged at 7 to an associated door frame B and can be provided with a suitable fastening mechanism comprising, for example, bolts (not shown) to be thrown into the frame B through the opening side edge of the door in response to manipulation of an
external handle 8, together with fixed stud bolts 9 on the hinge side edge of the door. - To demonstrate the efficacy of the above-described structures the following tests were conducted.
- A test door was constructed generally in accordance with Figures 1 to 3 hereof and having the following characteristics:
plate 2 was 3mm thick mild steel;plate 4 was 10mm thick mild steel; theframe sections 1 were 50mm square, 2.5mm wall thickness steel tube; the internal space between theplates timber layer 5 comprised 40mm thick maranti boards. This specimen was mounted in a typical frame and a limpet mine having a charge of 0.95kg of Tritanol explosive was applied to the surface ofplate 2. When the charge was detonated theplate 2 was blown off and thetimber 5 fell out, but theplate 4 attached tosections 1 remained intact and bolted to its frame, with some plastic deformation, so that the brrier as a whole was not breached. - A similar test was performed with a door constructed generally in accordance with Figure 4 and where:
plate 2 was 3mm thick mild steel;plate 4 was l6mm thick mild steel; theframe sections 1 were 75mm square, 2.5mm wall thickness steel tube; and the internal space between theplates maranti boards 5a,5b. This specimen was subject to the blast of a 2kg charge of TNT applied to the surface ofplate 2 and the results were as in the previously described test, although somewhat less severe. - Equivalent test specimens have also been found effectively to withstand high-velocity rifle fire from AK47 (Soviet), Rl (South African, equivalent to NATO G3) and R4 (South African) weapons.
- Turning now to Figures 5 and 6, these show a barrier structure for incorporation into a blast-resistant door which may withstand rather heavier charges than those of Figures 1 to 4 and which, in the illustrated embodiment, is designed also to be fire resistant. In this case, the barrier comprises essentially a double box-like structure. One "box".is composed of a steel plate 11 - which provides the outer face of the structure - attached to an
intermediate steel plate 12 viaframing sections 13, and stiffened byhorizontal angles 14. The other "box" is compsed of asteel back plate 15 welded to theplate 12 viaframing sections 16 andhorizontal stringers 17. Within the first of these compartments there is a layer oftimber 18 fronted by a layer of kieselguhr (diatomaceous earth) 19. In the completed door structure the rearward compartment betweenplates - The purpose of the
timber layer 8 in this structure is, as before, to confer resistance to an explosive attack upon the door by acting to absorb physical shock and to reduce the transmission of heat through the door to the steel behind it. To demonstrate the efficacy of this type of structure the following test was conducted. - A test specimen was constructed substantially in accordance with Figures 5 and 6 hereof and having the following characteristics: the overall thickness of the structure was 273mm;
plate 11 was 3mm thick mild steel;plate 12 was 20mm thick mild steel:plate 15 was 10mm thick mild steel; thetimber layer 18 was composed of 40mm thick maranti planks; and thekieselguhr layer 19 was 100mm thick. The specimen was supported in a rig to simulate its mounting to the associated door frame and a 3.33kg charge of type PE4 (cyclonite-based) plastic explosive (equivalent to about 5kg of dynamite) was applied to the surface ofplate 11. When the charge was detonated theplate 11 was destroyed but bothplates timber 18 around the immediate area of the explosion was disintegrated as was thekieselguhr layer 19, but thesteel plate 12 immediately behind this area of damage was only warm to the touch after the blast. - In this particular example the
kieselguhr layer 19 is provided to confer general fire resistance to the structure, and is not thought to make a significant contribution to blast resistance of itself. By replacing thelayer 19 in this structure with further timber, therefore, resistance to even heavier charges of explosive may be obtained.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85101347T ATE36889T1 (en) | 1984-02-11 | 1985-02-08 | SECURITY DOOR. |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8403628 | 1984-02-11 | ||
GB848403628A GB8403628D0 (en) | 1984-02-11 | 1984-02-11 | Security barrier structure |
GB8415743 | 1984-06-20 | ||
GB848415743A GB8415743D0 (en) | 1984-06-20 | 1984-06-20 | Security barrier structure |
ZA8410035 | 1984-12-21 | ||
ZA8410035 | 1984-12-21 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0152881A2 true EP0152881A2 (en) | 1985-08-28 |
EP0152881A3 EP0152881A3 (en) | 1986-05-28 |
EP0152881B1 EP0152881B1 (en) | 1988-08-31 |
Family
ID=27262278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850101347 Expired EP0152881B1 (en) | 1984-02-11 | 1985-02-08 | Security door assembly |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0152881B1 (en) |
AU (1) | AU3859985A (en) |
DE (1) | DE3564718D1 (en) |
GB (1) | GB2154639B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2658847A1 (en) * | 1990-02-23 | 1991-08-30 | Somenor Sa | Wall intended to withstand sudden variations in pressure, and method for constructing this wall |
GB2367850A (en) * | 2000-06-30 | 2002-04-17 | Door Panels Plc | Stress absorbing door panel |
FR2870880A1 (en) * | 2004-05-28 | 2005-12-02 | Mineur Becourt Systemes | Blast resistant door for bunker type building, has steel frames covered with fire-proof lining made from self supporting calcium silicate plates having thicknesses of 20mm determined according to performances against fire |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2237835B (en) * | 1989-10-31 | 1994-06-01 | Manchester City Council | A security door |
GB9423343D0 (en) * | 1994-11-18 | 1995-01-18 | Henry Brothers Magherafelt Lim | Blast resistant building structures |
GB9526398D0 (en) * | 1995-12-22 | 1996-02-21 | Kovacs Laurence K | Improvements in or relating to fire resisting doors |
US8707625B2 (en) * | 2011-06-28 | 2014-04-29 | Dan Raz Ltd. | Arrangement for securing a panel closure |
EP3341542B1 (en) | 2015-08-24 | 2020-05-13 | Dan Raz Ltd. | Securing mechanism for a sliding panel |
IL241392B (en) | 2015-09-09 | 2021-05-31 | Dan Raz Ltd | Door with supplementary hinge-side engagement |
US9970214B2 (en) | 2015-11-29 | 2018-05-15 | Dan Raz Ltd | Door or other closable panel with lock-actuating linkage |
US9988830B2 (en) | 2016-03-03 | 2018-06-05 | Dan Raz Ltd. | Latch arrangement having a handle |
US10487545B2 (en) | 2016-03-03 | 2019-11-26 | Dan Raz Ltd. | Latch arrangement having a stop latch |
CN106593224B (en) * | 2016-11-22 | 2018-08-17 | 重庆欧帆门业有限公司 | Anti-collision wooden door |
US11598125B2 (en) | 2017-09-03 | 2023-03-07 | Dan Raz Ltd. | Latch arrangement |
CN108412370B (en) * | 2018-02-07 | 2019-11-29 | 安徽忠盛新型装饰材料有限公司 | A kind of pin-connected panel carved wood door window and its assembling process |
CN113250593A (en) * | 2021-04-26 | 2021-08-13 | 赵学兰 | Explosion-proof people's air defense door |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE135849C (en) * | ||||
US3093098A (en) * | 1961-11-24 | 1963-06-11 | Morton M Rosenfeld | Door structure for bomb shelter |
DE2639691A1 (en) * | 1976-09-03 | 1978-03-09 | Bochumer Eisen Heintzmann | DOOR LOCK |
DE2740194A1 (en) * | 1977-09-07 | 1979-03-08 | Sommer Metallbau Stahlbau Gmbh | Multi-piece impact resistant door and case - have load-bearing door zone extending into hollow box case |
DE8224631U1 (en) * | 1982-09-01 | 1982-12-02 | Sälzer, Heinrich, 3550 Marburg | BURGLAR AND BULLET-PROOF STEEL DOORS FOR CONSTRUCTION OPENINGS |
AT370204B (en) * | 1979-12-18 | 1983-03-10 | Hamerle Vinzenz Ing | MULTILAYERED, BULLET-PROTECTED ARMOR FOR WINDOWS AND DOORS |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB509358A (en) * | 1937-04-15 | 1939-07-14 | Hugo Morawetz | Improvements in or relating to doors, panels and like structures, provided with edging strips |
GB505523A (en) * | 1938-04-21 | 1939-05-12 | Wilhelm Zanzinger | Improvements in doors |
-
1985
- 1985-02-07 GB GB08503134A patent/GB2154639B/en not_active Expired
- 1985-02-08 EP EP19850101347 patent/EP0152881B1/en not_active Expired
- 1985-02-08 DE DE8585101347T patent/DE3564718D1/en not_active Expired
- 1985-02-11 AU AU38599/85A patent/AU3859985A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE135849C (en) * | ||||
US3093098A (en) * | 1961-11-24 | 1963-06-11 | Morton M Rosenfeld | Door structure for bomb shelter |
DE2639691A1 (en) * | 1976-09-03 | 1978-03-09 | Bochumer Eisen Heintzmann | DOOR LOCK |
DE2740194A1 (en) * | 1977-09-07 | 1979-03-08 | Sommer Metallbau Stahlbau Gmbh | Multi-piece impact resistant door and case - have load-bearing door zone extending into hollow box case |
AT370204B (en) * | 1979-12-18 | 1983-03-10 | Hamerle Vinzenz Ing | MULTILAYERED, BULLET-PROTECTED ARMOR FOR WINDOWS AND DOORS |
DE8224631U1 (en) * | 1982-09-01 | 1982-12-02 | Sälzer, Heinrich, 3550 Marburg | BURGLAR AND BULLET-PROOF STEEL DOORS FOR CONSTRUCTION OPENINGS |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2658847A1 (en) * | 1990-02-23 | 1991-08-30 | Somenor Sa | Wall intended to withstand sudden variations in pressure, and method for constructing this wall |
GB2367850A (en) * | 2000-06-30 | 2002-04-17 | Door Panels Plc | Stress absorbing door panel |
GB2367850B (en) * | 2000-06-30 | 2004-01-28 | Door Panels Plc | Doors |
FR2870880A1 (en) * | 2004-05-28 | 2005-12-02 | Mineur Becourt Systemes | Blast resistant door for bunker type building, has steel frames covered with fire-proof lining made from self supporting calcium silicate plates having thicknesses of 20mm determined according to performances against fire |
Also Published As
Publication number | Publication date |
---|---|
EP0152881B1 (en) | 1988-08-31 |
AU3859985A (en) | 1985-08-15 |
DE3564718D1 (en) | 1988-10-06 |
EP0152881A3 (en) | 1986-05-28 |
GB8503134D0 (en) | 1985-03-13 |
GB2154639A (en) | 1985-09-11 |
GB2154639B (en) | 1987-06-03 |
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