EP0912813A1 - Safety door assembly, in particular a sterile door - Google Patents
Safety door assembly, in particular a sterile doorInfo
- Publication number
- EP0912813A1 EP0912813A1 EP97937488A EP97937488A EP0912813A1 EP 0912813 A1 EP0912813 A1 EP 0912813A1 EP 97937488 A EP97937488 A EP 97937488A EP 97937488 A EP97937488 A EP 97937488A EP 0912813 A1 EP0912813 A1 EP 0912813A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- door leaf
- compressed air
- sealing
- hose
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 239000004033 plastic Substances 0.000 claims abstract description 3
- 229920003023 plastic Polymers 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000000645 desinfectant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010353 genetic engineering Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000003958 fumigation Methods 0.000 description 1
- 230000009760 functional impairment Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000002458 infectious effect Effects 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/16—Sealing arrangements on wings or parts co-operating with the wings
- E06B7/22—Sealing arrangements on wings or parts co-operating with the wings by means of elastic edgings, e.g. elastic rubber tubes; by means of resilient edgings, e.g. felt or plush strips, resilient metal strips
- E06B7/23—Plastic, sponge rubber, or like strips or tubes
- E06B7/2318—Plastic, sponge rubber, or like strips or tubes by applying over- or under-pressure, e.g. inflatable
Definitions
- the invention relates to a security door, in particular
- Sterile door for access to security rooms and in particular sterile rooms, which has a surrounding door frame and a single-leaf door leaf, which is connected to the door frame with the help of door hinges, and a sealing system that can be switched on and off with pressure medium actuation.
- a security door and in particular a sterile door serves to delimit security and sterile areas.
- These can be, for example, pathogen-free areas (e.g. SPF animal husbandry, cell and tissue cultures) with the exclusion of ubiguinary germs using positive room pressures, as well as infectious areas (viruses, bacteria, fungi, yeasts, spores, etc.) to prevent environmental contamination using negative room pressures.
- bio and genetic engineering security areas as well as physical and chemical security areas are typical applications for a security or sterile door.
- the delimitation of bio and genetic engineering security areas is necessary in order to exclude ubiquitous germs.
- the delimitation of physical safety areas for example in radionuclide areas, aims to prevent environmental contamination through air transmission and nuclide carryover. For fumigation chambers and -
- the peripheral door frame has a lintel element, door reveal elements and a door sill element.
- the door frame is connected to the associated room wall, which is preferably a lightweight wall, because sterile metal walls are often used in sandwich construction.
- Security doors are known in various embodiments.
- an embodiment is known in particular in which the door leaf in its door leaf edge, facing the frame, has a circumferential, hollow sealing profile belonging to the sealing system, which is connected to the door leaf.
- the hollow sealing profile is not a hose seal if a hose seal is understood to mean a seal that has a round or rectangular hose cross section that can be inflated.
- a longitudinal, cross-sectionally M-shaped indentation is provided which, as it were, protrudes under the influence of the pressure medium causing the seal and surrounds it in an associated vie, and inversely when the pressure is released moved back.
- a security door in particular a sterile door, which is characterized by simplicity and functional reliability, avoids special fitting problems and ensures that both the sealing and the pressure relief, in connection with this opening of the door leaf, occur in very short periods of time respectively.
- Counter solution is to solve this technical problem.
- a security door in particular a sterile door, for a room opening which allows access to security rooms or sterile rooms, which has a surrounding door frame and a single-leaf door leaf which is connected to the door frame with the aid of door hinges, and a sealing system which can be switched on and off with pressure medium actuation ,
- the rebate-free door leaf has in its door leaf edge, facing the rebate-free door frame, a circumferential rubber or plastic hose seal belonging to the sealing system, which is sealingly connected to the door leaf and with a specified sealing force against an autogenous one
- Restoring force is inflatable
- the frame surface facing the hose seal is designed as a flat, non-deformable sealing counter surface against which the inflated
- the sealing system is automatically controlled and has a compressed air source, a compressed air line system and a pressure relief system with control valves with which components when the sealing system is switched on, the hose seal can be inflated and via which components the hose seal can be blown out when the sealing system is switched off,
- the compressed air source, the compressed air line system and the compressed air inflow cross section of the hose seal are set up in such a way that the sealing force additionally locks the closed door leaf against the door frame quickly and securely by means of a frictional lock, and wherein the pressure relief system and the compressed air outflow cross section of the hose seal are set up so that the Door leaf locked via frictional engagement is unlocked in a relief period of 1 to 6 seconds, preferably 1 to 3 seconds.
- the invention is based on the knowledge that when using a hose seal set up for corresponding pressures of the pressure medium, a positive locking between the door leaf and the door frame with the help of the sealing profile can be dispensed with if the sealing force is chosen and set up so large that the locking can be done via friction. This avoids fit problems and the resulting disadvantages.
- very high pressures of the pressure medium and thus very high sealing forces are used also means that the sealing and the associated locking can take place in an extremely short period of time. and that because of the high restoring forces, the pressure relief of the hose seal and thus the opening of the door leaf can be achieved in an extremely short period of time.
- the extremely quick locking and opening of the door leaf is optimized in that a sufficiently large compressed air flow cross section and compressed air discharge cross section are realized for the hose seal.
- High pressures of the pressure medium which can be not only compressed air, but also another gas, mean pressures in the order of magnitude of 3 and more bar, for example.
- the door leaf is simply brought into position and then closes automatically, the positioning being checked via an electrical proximity switch, for example a reed contact.
- the simple operation of the Oi via an electric pushbutton and when the door leaf is sealed by simply closing the safety or sterile door without further manual operation ensure that the door leaf is kept closed even after repeated use and does not remain open during breaks.
- a manual valve for emergency release in the event of danger can be installed in the pressure relief system, which is located next to the door frame on the wall, for example, and with which the door leaf can be opened independently of the electronically controlled sealing system.
- the door leaf and the surrounding door frame preferably have rounded corners that are matched to one another, in order to achieve a perfect seal between the mating sealing surface and the hose seal in the corner areas as well.
- the frame corners can be rounded off using appropriate filler pieces. Since the door frame, in particular in the case of walls of lightweight construction, is only minimally supported, the invention provides that the door frame has high strength and inherent rigidity and is consequently designed as a self-supporting door frame. Furthermore, it is preferably designed as a smooth surface to face the hose seal, in order to facilitate disinfection measures. For this reason, there is no need to fold the door frame and door leaf.
- the door leaf is essentially symmetrical in the frame profile, so that the disinfection effect is equivalent on both sides.
- the invention provides that the door leaf is designed as a double-skin door leaf and that the door leaf and optionally the door frame are sound-insulated and, if necessary, heat-insulated by means of insulation. This fulfills a requirement in the animal area for suppressing extraneous noise. The sonic damides goes well beyond the values of comparable doors.
- the door leaf is expediently designed as a smooth-walled door leaf with only one handle, for example a push or pull handle, and possibly a door window. Because within the scope of the invention, elaborate actuators for the door leaf can be dispensed with, in particular also a door lock, the keyhole of which does not permit a perfect delimitation between security and sterile areas.
- the hose seal is preferably made of permanently elastic material and is therefore characterized by a long service life.
- the compressed air inflow cross section and the compressed air outflow cross section are identical.
- the compressed air inflow cross section and the compressed air outflow cross section are formed by 2 or more pressure air channels in the door leaf, which are connected to the hose seal via hose plug-in couplings and are connected to the compressed air line system.
- the hose plug-in couplings ensure a particularly simple embodiment in terms of production technology. In addition, flow noise and consequently disturbing noise development are avoided.
- the hose seal arranged in a circumferential groove of the door leaf, in such a way that it closes in the pressure-relieved state at the upper edge of the groove and protrudes in the inflated state over the upper edge of the groove.
- the hose seal can have a circular cross section.
- a relatively large sealing surface can be realized on the associated wall of the door frame, and the corresponding surface of the hose seal can be provided with special sealing ribs.
- the compressed air line system has connection components which are inserted into the door leaf via a door hinge and a hinge and are connected there to the hose seal.
- the door leaf can be designed as a double-layered door leaf, which is advantageous with regard to the assembly of the hose seal but also with regard to the connection of the hose seal to the connecting components, because there is sufficient space available in the door leaf.
- the double-skin design of the door leaf has the further advantage that foaming can be carried out.
- This also applies to the door frame, so that the security door according to the invention can also be designed to be soundproof and heat-insulating at the same time. It is about an embodiment with a door leaf that can only be opened on one side, a mechanical stop can also be provided which determines the opening direction. It goes without saying that for the purpose of closing the door with a door lock, the usual locking devices can also be arranged.
- Fig. 7 in a further enlarged scale, the hinge with hinge and connecting components, the hinge partially in section.
- the security door 1 shown in FIG. 1 is intended for a room opening which allows access to a security or control room. If you add the other figures, you can see that the security door has a door frame 2 and a single-leaf door leaf 3, which is connected to the door frame 2 by means of door hinges 4.
- a sealing system 5 with pressure medium actuation that can be switched on and off is provided, to which a plurality of components and units belong, which will be explained below.
- the door leaf 3 carries in its door leaf edge, facing the frame, a circumferential hose seal 6, which belongs to the sealing system 5.
- the circumferential hose seal 6 can be seen in FIGS. 3 and 4 and in sections in FIGS. 5 and 6.
- the sealing system 5 can be inflated with a predetermined sealing force against an autogenous restoring force. 6 shows the inflated state. Autogenous restoring force means that the restoring force is due to the elastic deformation of the hose seal 6 developed when inflated.
- the frame surface facing the door leaf 3 is designed as a flat sealing counter surface 7 that is practically non-deformable in the functional state. For this purpose, reference is also made to FIG. 6.
- the sealing system 5 has a pressure medium source 9, preferably a compressed air source or another gas source, a compressed air line system 10 with control valves 11 and a pressure relief system 12 with a control system.
- the hose seal 6 can be inflated when the sealing system 5 is switched on.
- the hose seal 6 can be blown out, under the influence of the restoring forces already explained.
- the pressure medium source 9 and the pressure medium line system 10 are set up in such a way that the sealing force securely locks the closed door leaf 3 against the door frame 2 via a friction lock.
- the Pressure relief system 12 is set up in such a way that it unlocks the door leaf 3, which is locked via frictional engagement, in a relief period of only a few seconds.
- the restoring force of the hose seal 6 is dimensioned accordingly.
- the hose seal 6 is inserted in a circumferential groove 13 of the door leaf 3, in such a way that it closes at the upper edge of the groove 13 in the pressure-relieved state, as can be seen in particular in FIGS. 5 and 6 .
- the design is such that the hose seal 6 projects over the upper edge of the groove 13 in the inflated state.
- the hose seal 6 has an essentially rectangular hose profile in the pressure-relieved state.
- the compressed air line system 10 has connection components 14 which are inserted via a door hinge 4 and a hinge 15 into the door leaf 3 and are connected there to the hose seal 6.
- the door leaf 3 is a double-skin door leaf 3, it is foamed like the frame 2 for the purpose of sound and heat insulation.
- the door leaf 3 and the surrounding door frame 2 have coordinated rounded corners.
- the door leaf 3 is designed as a smooth-walled door leaf with only one handle 16 and a door window 17.
- the compressed air Flow cross section and the compressed air outflow cross section of the hose seal 6 are formed by two compressed air channels 18 in the door leaf 3, which are connected to the hose seal 6 via hose plug-in couplings and are connected to the compressed air line system 10.
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
- Housing For Livestock And Birds (AREA)
- Special Wing (AREA)
- Wing Frames And Configurations (AREA)
- Artificial Filaments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19628747A DE19628747C2 (en) | 1996-07-17 | 1996-07-17 | Security door, especially sterile door |
DE19628747 | 1996-07-17 | ||
PCT/EP1997/003787 WO1998003761A1 (en) | 1996-07-17 | 1997-07-15 | Safety door assembly, in particular a sterile door |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0912813A1 true EP0912813A1 (en) | 1999-05-06 |
EP0912813B1 EP0912813B1 (en) | 2000-12-13 |
Family
ID=7800023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97937488A Expired - Lifetime EP0912813B1 (en) | 1996-07-17 | 1997-07-15 | Safety door assembly, in particular a sterile door |
Country Status (11)
Country | Link |
---|---|
US (1) | US6195941B1 (en) |
EP (1) | EP0912813B1 (en) |
JP (1) | JP3955098B2 (en) |
AT (1) | ATE198094T1 (en) |
CA (1) | CA2236536C (en) |
CZ (1) | CZ295638B6 (en) |
DE (2) | DE19628747C2 (en) |
ES (1) | ES2152696T3 (en) |
HU (1) | HU221070B1 (en) |
PL (1) | PL184621B1 (en) |
WO (1) | WO1998003761A1 (en) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2342377B (en) * | 1999-08-10 | 2000-08-30 | John Price | Door or window with inflatable anti-flood seals |
EP1154118A1 (en) | 2000-05-08 | 2001-11-14 | Georges Emile Puljiz | Sealing against all water entries |
US6485029B1 (en) * | 2000-10-11 | 2002-11-26 | The United States Of America As Represented By The Secretary Of The Navy | Inflatable sealing device |
NL1023562C2 (en) * | 2003-05-28 | 2004-11-30 | Elton Bv Ind & Handel | Sealing device for a door or the like, inflatable seal for such a sealing device, as well as a door or the like provided with such a sealing device or seal. |
AU2003304225A1 (en) * | 2003-06-26 | 2005-01-04 | Sig Technology Ltd. | Protective structure for an apparatus for the handling of containers |
US20050247823A1 (en) * | 2004-05-04 | 2005-11-10 | Wood Jeffrey H | Injection-molded polycarbonate door |
JP4433463B2 (en) * | 2004-05-14 | 2010-03-17 | 五洋建設株式会社 | Washable room structure and room washing method |
ITBO20040331A1 (en) * | 2004-05-25 | 2004-08-25 | Ima Spa | SEPARATION STRUCTURE FOR THE INSULATION OF THE EXTERNAL ENVIRONMENT OF A DELIMITED SPACE |
US7658417B2 (en) | 2006-02-24 | 2010-02-09 | Apical Industries, Inc. | Hose hinge assembly |
US7743560B2 (en) * | 2006-04-28 | 2010-06-29 | Box Neil K | Door sealing system |
GB0624563D0 (en) * | 2006-12-08 | 2007-01-17 | Ian Harrison Associates | Improved door |
ITFI20070095A1 (en) * | 2007-04-18 | 2008-10-19 | Casafortes Hld S R L | APPARATUS FOR PROTECTION OF ENVIRONMENTS CLOSED BY FLOODING OR CONTAMINATION. |
GB2457229A (en) * | 2008-02-05 | 2009-08-12 | Paul Anthony Turner | Flood defence apparatus |
US8109551B2 (en) * | 2009-02-04 | 2012-02-07 | New Flyer Industries Canada Ulc | Bus cabin structure |
EP2273055B1 (en) * | 2009-05-04 | 2016-02-17 | Air-lux technik ag | Device for sealingly closing a room opening |
CN101988367B (en) * | 2009-07-30 | 2012-08-22 | 李宝龄 | Reusable automatic pressure relief device |
JP5543169B2 (en) * | 2009-10-14 | 2014-07-09 | 麒麟麦酒株式会社 | Enclosure structure |
US8595983B2 (en) * | 2010-04-23 | 2013-12-03 | Gaven Industries, Inc. | Door and system providing radio frequency shielding against high-altitude electromagnetic pulse |
GB2542402A (en) * | 2015-09-18 | 2017-03-22 | Ruskinn Tech Ltd | Sealing method for controlled atmosphere apparatus |
CN108691487B (en) * | 2018-05-11 | 2024-04-12 | 中国科学院西安光学精密机械研究所 | Self-falling sealing cabin door structure and installation method |
CN108915501A (en) * | 2018-07-20 | 2018-11-30 | 中国科学院武汉病毒研究所 | A kind of air heave type hermatic door for high-level biosafety laboratory |
CN112294577B (en) * | 2020-12-10 | 2024-09-10 | 成都天空燃控科技股份有限公司 | Transition cabin for life cabin to get in and out |
CN115199184B (en) * | 2022-07-11 | 2023-05-30 | 四川大学华西医院 | Operating room door with multiple opening modes |
CN115559651A (en) * | 2022-10-21 | 2023-01-03 | 福建省铭时门业科技有限公司 | Air bag type airtight door capable of clamping, inflating and reflowing |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE484095C (en) * | 1929-10-10 | E H Walther Voith Dr Ing | Airtight and soundproof closure of the gaps on doors, windows and walls | |
DE576156C (en) | 1929-11-20 | 1933-05-08 | Gustav Schoeni | Aerator |
US2720011A (en) * | 1951-05-11 | 1955-10-11 | Goodrich Co B F | Inflatable closing strip for aircraft |
US2763038A (en) * | 1952-05-13 | 1956-09-18 | Adlake Co | Window structure |
US2757225A (en) * | 1952-12-24 | 1956-07-31 | Ace Engineering & Machine Co I | Doors for radio shielded enclosures |
US3397490A (en) * | 1967-04-12 | 1968-08-20 | Presray Corp | Sealable closure |
US3507974A (en) * | 1968-03-06 | 1970-04-21 | Us Navy | Electromagnetic shielded door structure |
DE7525876U (en) * | 1975-08-13 | 1976-01-29 | E. Mueseler Inh. Oswald Koch, 1000 Berlin | GAS-TIGHT DOOR |
CH603984A5 (en) * | 1976-11-15 | 1978-08-31 | Bauer Kassenfabrik Ag | |
DE2851459C2 (en) * | 1978-11-28 | 1980-11-27 | Metall + Plastic Gmbh, 7760 Radolfzell | Gas-tight closing door |
US4335075A (en) * | 1980-12-22 | 1982-06-15 | Vernitron Corporation | Door seal for sterilizer |
US4441278A (en) | 1981-11-12 | 1984-04-10 | The Presray Corporation | Mounting for endless sealing strips |
DE3425890A1 (en) * | 1984-07-13 | 1986-01-23 | Blohm + Voss Ag, 2000 Hamburg | SHIP DOOR OR HATCH ARRANGEMENT |
DE3628271A1 (en) * | 1986-08-20 | 1988-02-25 | Alwin Hoernschemeyer | Joint seal, in particular for windows and doors |
CA1272417A (en) * | 1986-11-27 | 1990-08-07 | Leonard William Westwell | Airtight door assembly |
FR2665499B1 (en) * | 1990-07-10 | 1994-01-28 | Joint Francais | SEALING DEVICE WITH INFLATABLE JOINT FOR MOBILE DOOR OR PANEL. |
AT403148B (en) * | 1992-01-08 | 1997-11-25 | Wiener Metallwerk Gesmbh | EXTERIOR DOORS, IN PARTICULAR TRANSITION DOORS ON THE FRONT WALL, A WAGGON FOR RAILWAY PASSENGER TRANSPORT AND METHODS FOR OPENING AND CLOSING THE SAME |
-
1996
- 1996-07-17 DE DE19628747A patent/DE19628747C2/en not_active Expired - Fee Related
-
1997
- 1997-07-15 US US09/101,246 patent/US6195941B1/en not_active Expired - Fee Related
- 1997-07-15 PL PL97329370A patent/PL184621B1/en not_active IP Right Cessation
- 1997-07-15 CA CA002236536A patent/CA2236536C/en not_active Expired - Fee Related
- 1997-07-15 AT AT97937488T patent/ATE198094T1/en not_active IP Right Cessation
- 1997-07-15 EP EP97937488A patent/EP0912813B1/en not_active Expired - Lifetime
- 1997-07-15 HU HU9902178A patent/HU221070B1/en not_active IP Right Cessation
- 1997-07-15 JP JP50652898A patent/JP3955098B2/en not_active Expired - Fee Related
- 1997-07-15 CZ CZ19984275A patent/CZ295638B6/en not_active IP Right Cessation
- 1997-07-15 DE DE59702764T patent/DE59702764D1/en not_active Expired - Lifetime
- 1997-07-15 WO PCT/EP1997/003787 patent/WO1998003761A1/en active IP Right Grant
- 1997-07-15 ES ES97937488T patent/ES2152696T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9803761A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE198094T1 (en) | 2000-12-15 |
DE19628747C2 (en) | 2000-11-30 |
DE59702764D1 (en) | 2001-01-18 |
PL184621B1 (en) | 2002-11-29 |
PL329370A1 (en) | 1999-03-29 |
CA2236536A1 (en) | 1998-01-29 |
ES2152696T3 (en) | 2001-02-01 |
HUP9902178A1 (en) | 1999-11-29 |
JP3955098B2 (en) | 2007-08-08 |
CZ295638B6 (en) | 2005-09-14 |
HU221070B1 (en) | 2002-07-29 |
DE19628747A1 (en) | 1998-01-29 |
JP2000514516A (en) | 2000-10-31 |
WO1998003761A1 (en) | 1998-01-29 |
EP0912813B1 (en) | 2000-12-13 |
HUP9902178A3 (en) | 2000-01-28 |
US6195941B1 (en) | 2001-03-06 |
CA2236536C (en) | 2005-01-04 |
CZ427598A3 (en) | 1999-11-17 |
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