DE69221330T2 - Abdichtungsvorrichtung und -verfahren für eine brennstoffzelle - Google Patents
Abdichtungsvorrichtung und -verfahren für eine brennstoffzelleInfo
- Publication number
- DE69221330T2 DE69221330T2 DE69221330T DE69221330T DE69221330T2 DE 69221330 T2 DE69221330 T2 DE 69221330T2 DE 69221330 T DE69221330 T DE 69221330T DE 69221330 T DE69221330 T DE 69221330T DE 69221330 T2 DE69221330 T2 DE 69221330T2
- Authority
- DE
- Germany
- Prior art keywords
- fuel cell
- sealing device
- sealing
- fuel
- cell
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
- H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/766,745 US5284718A (en) | 1991-09-27 | 1991-09-27 | Fuel cell membrane electrode and seal assembly |
PCT/US1992/008222 WO1994009520A1 (en) | 1991-09-27 | 1992-10-20 | Fuel cell sealing gasket apparatus and method |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69221330D1 DE69221330D1 (de) | 1997-09-04 |
DE69221330T2 true DE69221330T2 (de) | 1998-01-15 |
Family
ID=26785046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69221330T Expired - Fee Related DE69221330T2 (de) | 1991-09-27 | 1992-10-20 | Abdichtungsvorrichtung und -verfahren für eine brennstoffzelle |
Country Status (6)
Country | Link |
---|---|
US (1) | US5284718A (de) |
EP (1) | EP0665984B1 (de) |
JP (1) | JP3045316B2 (de) |
AU (1) | AU675415B2 (de) |
DE (1) | DE69221330T2 (de) |
WO (1) | WO1994009520A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010028957A1 (de) * | 2010-05-12 | 2011-11-17 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Brennstoffzellenstapel und Verfahren zum Herstellen eines Brennstoffzellenstapels |
Families Citing this family (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5284718A (en) * | 1991-09-27 | 1994-02-08 | Ballard Power Systems Inc. | Fuel cell membrane electrode and seal assembly |
US5482680A (en) * | 1992-10-09 | 1996-01-09 | Ballard Power Systems, Inc. | Electrochemical fuel cell assembly with integral selective oxidizer |
US5527363A (en) * | 1993-12-10 | 1996-06-18 | Ballard Power Systems Inc. | Method of fabricating an embossed fluid flow field plate |
US5470671A (en) * | 1993-12-22 | 1995-11-28 | Ballard Power Systems Inc. | Electrochemical fuel cell employing ambient air as the oxidant and coolant |
US5486430A (en) * | 1994-09-01 | 1996-01-23 | Ballard Power Systems Inc. | Internal fluid manifold assembly for an electrochemical fuel cell stack array |
US6312845B1 (en) | 1995-10-06 | 2001-11-06 | The Dow Chemical Company | Macroporous flow field assembly |
DE19542475C2 (de) * | 1995-11-15 | 1999-10-28 | Ballard Power Systems | Polymerelektrolytmembran-Brennstoffzelle sowie Verfahren zur Herstellung einer Verteilerplatte für eine solche Zelle |
GB2348047B (en) * | 1997-03-29 | 2001-04-11 | Ballard Power Systems | Electrochemical cells |
DE19713250C2 (de) * | 1997-03-29 | 2002-04-18 | Ballard Power Systems | Elektrochemischer Energiewandler mit Polymerelektrolytmembran |
US5976726A (en) * | 1997-05-01 | 1999-11-02 | Ballard Power Systems Inc. | Electrochemical cell with fluid distribution layer having integral sealing capability |
US5942347A (en) * | 1997-05-20 | 1999-08-24 | Institute Of Gas Technology | Proton exchange membrane fuel cell separator plate |
US6423439B1 (en) | 1997-07-16 | 2002-07-23 | Ballard Power Systems Inc. | Membrane electrode assembly for an electrochemical fuel cell |
JP3918265B2 (ja) * | 1997-11-21 | 2007-05-23 | トヨタ自動車株式会社 | 燃料電池の製造方法 |
JPH11219714A (ja) * | 1998-02-03 | 1999-08-10 | Matsushita Electric Ind Co Ltd | 燃料電池 |
EP1009052B1 (de) * | 1998-06-02 | 2012-02-15 | Panasonic Corporation | Polymer-elektrolyt-brennstoffzelle und verfahren zu dessen herstellung |
US6207312B1 (en) | 1998-09-18 | 2001-03-27 | Energy Partners, L.C. | Self-humidifying fuel cell |
US6492043B1 (en) | 1998-12-23 | 2002-12-10 | Ballard Power Systems Inc. | Method and apparatus for detecting a leak within a fuel cell |
DE19908555A1 (de) * | 1999-02-27 | 2000-09-28 | Freudenberg Carl Fa | Dichtungsanordnung für großflächige dünne Teile |
US6235166B1 (en) | 1999-06-08 | 2001-05-22 | E-Cell Corporation | Sealing means for electrically driven water purification units |
EP1196353B1 (de) | 1999-06-08 | 2011-02-09 | E-Cell Corporation | Dichtungsvorrichtungen für elektrisch betriebene wasserreinigungseinheiten und verfahren zu ihrer herstellung |
US6231053B1 (en) * | 1999-06-11 | 2001-05-15 | Nok Corporation | Gasket for fuel cell |
GB9915925D0 (en) * | 1999-07-08 | 1999-09-08 | Univ Loughborough | Flow field plates |
US6426159B1 (en) | 1999-08-27 | 2002-07-30 | Plug Power Inc. | Sealing method and apparatus for a fuel cell stack |
US6303245B1 (en) | 1999-08-27 | 2001-10-16 | Plug Power Inc. | Fuel cell channeled distribution of hydration water |
US6355371B1 (en) | 1999-08-27 | 2002-03-12 | Plug Power Inc. | Profiled fuel cell flow plate gasket |
US6261711B1 (en) * | 1999-09-14 | 2001-07-17 | Plug Power Inc. | Sealing system for fuel cells |
US6689439B2 (en) | 2000-03-08 | 2004-02-10 | Zbigniew S. Sobolewski | Micro-stud diffusion substrate for use in fuel cells |
JP3866050B2 (ja) | 2000-05-02 | 2007-01-10 | 本田技研工業株式会社 | 燃料電池 |
EP1290068B1 (de) * | 2000-06-02 | 2010-08-25 | SRI International | Polymermembranzusammensetzung |
CN100487966C (zh) * | 2000-06-29 | 2009-05-13 | Nok株式会社 | 燃料电池构成部件 |
DE10048871A1 (de) * | 2000-07-14 | 2002-03-14 | Freudenberg Carl | Flachdichtung |
US6475651B1 (en) | 2000-07-31 | 2002-11-05 | Ballard Power Systems Inc. | Method and apparatus for detecting transfer leaks in fuel cells |
JP3698038B2 (ja) * | 2000-09-12 | 2005-09-21 | 日産自動車株式会社 | 固体高分子膜型燃料電池 |
US6596427B1 (en) | 2000-11-06 | 2003-07-22 | Ballard Power Systems Inc. | Encapsulating seals for electrochemical cell stacks and methods of sealing electrochemical cell stacks |
JP4776787B2 (ja) * | 2001-01-30 | 2011-09-21 | 本田技研工業株式会社 | 燃料電池及びその製造方法 |
US20030013001A1 (en) * | 2001-03-30 | 2003-01-16 | Koch Steve George | Carrier gasket for a fuel cell |
CN1328812C (zh) * | 2001-04-23 | 2007-07-25 | Nok株式会社 | 燃料电池及其制造方法 |
US7432007B2 (en) * | 2001-05-15 | 2008-10-07 | Dana Automotive Systems Group Llc | Molded fuel cell plates with seals |
US20050095492A1 (en) * | 2001-05-15 | 2005-05-05 | Hydrogenics Corporation | Fuel cell stack |
GB0112021D0 (en) * | 2001-05-17 | 2001-07-11 | Johnson Matthey Plc | Substrate |
ATE400904T1 (de) * | 2001-06-01 | 2008-07-15 | Polyfuel Inc | Austauschbare brennstoffpatrone, brennstoffzellenaggregat mit besagter brennstoffpatrone für tragbare elektronische geräte und entsprechendes gerät |
US7316855B2 (en) * | 2001-06-01 | 2008-01-08 | Polyfuel, Inc. | Fuel cell assembly for portable electronic device and interface, control, and regulator circuit for fuel cell powered electronic device |
JP4000790B2 (ja) | 2001-06-08 | 2007-10-31 | トヨタ自動車株式会社 | シール構造を有する燃料電池 |
US6777127B2 (en) | 2001-06-22 | 2004-08-17 | Ballard Power Systems Inc. | Systems, apparatus and methods for bonding and/or sealing electrochemical cell elements and assemblies |
EP1433214A1 (de) * | 2001-09-27 | 2004-06-30 | Lenzing Aktiengesellschaft | Wasserdurchlässiges blatt und dessen anwendungen |
US20030221311A1 (en) * | 2002-03-20 | 2003-12-04 | Smith Jeffrey A. | Fuel cell assembly and sealing |
AU2003228942A1 (en) * | 2002-05-09 | 2003-11-11 | Anuvu, Inc. , A California Corporation | Electrochemical fuel cell comprised of a series of conductive compression gaskets and method of manufacture |
EP1518290A4 (de) * | 2002-05-13 | 2009-12-02 | Polyfuel Inc | Ionenleitende blockcopolymere |
US20030224237A1 (en) * | 2002-05-30 | 2003-12-04 | Vanderleeden Olen R. | Membrane electrode assembly for an electrochemical fuel cell |
JP3951841B2 (ja) * | 2002-07-19 | 2007-08-01 | トヨタ自動車株式会社 | 燃料電池のシール構造とその製造方法 |
US20050281981A1 (en) * | 2002-08-30 | 2005-12-22 | Raymond Puffer | Fixtures and methods for facilitating the fabrication of devices having thin film materials |
CN100347896C (zh) * | 2002-11-20 | 2007-11-07 | 许纲 | 一种燃料电池膜电极及其制造方法 |
CA2413467A1 (en) * | 2002-11-29 | 2004-05-29 | Ian Glenn Towe | Spacer for electrically driven membrane process apparatus |
KR20050084113A (ko) * | 2002-12-02 | 2005-08-26 | 폴리퓨얼, 인코포레이티드 | 휴대형 전자기기용 연료 전지 카트리지 |
US6716550B1 (en) | 2002-12-20 | 2004-04-06 | Ballard Power Systems Inc. | Sealing membrane electrode assemblies for electrochemical fuel cells |
DE10261482A1 (de) * | 2002-12-23 | 2004-07-01 | Basf Ag | Brennstoffzellenmodul |
CA2455063A1 (en) * | 2003-01-09 | 2004-07-09 | Ballard Power Systems Inc. | Method and apparatus for locating internal transfer leaks within fuel cell stacks |
JP4505188B2 (ja) * | 2003-01-30 | 2010-07-21 | 本田技研工業株式会社 | 燃料電池 |
CN1536698B (zh) | 2003-04-02 | 2010-12-15 | 松下电器产业株式会社 | 燃料电池用电解质膜结构、mea结构及燃料电池 |
US7404884B2 (en) * | 2003-04-25 | 2008-07-29 | Siemens Water Technologies Holding Corp. | Injection bonded articles and methods |
US7655339B1 (en) * | 2003-06-06 | 2010-02-02 | Dana Automotive Systems Group, Llc | Molded fuel cell plates with seals |
AU2003304303A1 (en) * | 2003-07-03 | 2005-01-21 | Li, Sanyou | Integrative membrane electrode for an electrochemical device and production method of the same |
JP4502135B2 (ja) * | 2003-07-08 | 2010-07-14 | Nok株式会社 | 燃料電池用セパレータ |
CA2477358C (en) | 2003-08-22 | 2012-03-27 | Matsushita Electric Industrial Co., Ltd. | Polymer electrolyte fuel cell |
KR100618233B1 (ko) * | 2004-05-18 | 2006-09-01 | 에스케이씨 주식회사 | 고분자전해질막 연료전지용 막 전극 어셈블리의 분극 특성평가 시스템 |
JP2005347256A (ja) * | 2004-05-28 | 2005-12-15 | Ei Du Pont Canada Co | 電気化学的電池構成要素用の新規な密封剤 |
GB0413515D0 (en) * | 2004-06-16 | 2004-07-21 | Itm Power Ltd | Method of production |
JP5142530B2 (ja) * | 2004-10-08 | 2013-02-13 | パナソニック株式会社 | 高分子電解質形燃料電池 |
JP2006221897A (ja) * | 2005-02-09 | 2006-08-24 | Nissan Motor Co Ltd | 燃料電池 |
EP1922137B1 (de) * | 2005-09-09 | 2017-07-26 | Tangenx Technology Corporation | Laminierte kassettenvorrichtung |
EP2193834A1 (de) * | 2005-12-20 | 2010-06-09 | Tangenx Technology Corporation | Filteranordnung sowie Herstellungs- und Verwendungsverfahren dafür |
US8101320B2 (en) * | 2006-02-21 | 2012-01-24 | GM Global Technology Operations LLC | Fuel cell integrated humidification |
US8470497B2 (en) * | 2006-11-08 | 2013-06-25 | GM Global Technology Operations LLC | Manufacture of membrane electrode assembly with edge protection for PEM fuel cells |
US20080118802A1 (en) * | 2006-11-16 | 2008-05-22 | Peter Szrama | Fully Catalyzed Membrane Assembly With Attached Border |
WO2009048991A1 (en) * | 2007-10-08 | 2009-04-16 | Ames Rubber Corporation | Composite multilayer seal for pem fuel cell applications and method for constructing the same |
KR20090078550A (ko) * | 2008-01-15 | 2009-07-20 | 삼성전자주식회사 | 연료전지 및 그 연료전지에 채용되는 스택과 냉각플레이트 |
US20110177423A1 (en) * | 2010-01-21 | 2011-07-21 | Anton Nachtmann | Five-Layer Membrane Electrode Assembly with Attached Border and Method of Making Same |
KR20120105331A (ko) * | 2011-03-15 | 2012-09-25 | 현대자동차주식회사 | 내부식성이 향상된 연료전지 스택 |
DE102012009727A1 (de) * | 2011-05-26 | 2012-11-29 | Tedatex Industrie Gmbh Beratung-Planung-Entwicklung | Brennstoffzelle ohne Bipolarplatte mit in Teilzellen unterteilten Zellen und integriertem Strompfad |
US20150236360A1 (en) * | 2014-02-19 | 2015-08-20 | Proton Energy Systems, Inc. | Electrochemical cell with protector gasket arrangement |
EP3012892B1 (de) * | 2014-10-24 | 2017-07-19 | Swiss Hydrogen SA | Elektrochemische Anordnung zum Stapeln |
JP6236103B2 (ja) * | 2016-03-01 | 2017-11-22 | 本田技研工業株式会社 | 燃料電池スタック |
CN108461775B (zh) * | 2016-12-10 | 2020-12-04 | 中国科学院大连化学物理研究所 | 一种高温质子交换膜燃料电池用金属复合密封垫及应用 |
US11824238B2 (en) | 2019-04-30 | 2023-11-21 | Hyaxiom, Inc. | System for managing hydrogen utilization in a fuel cell power plant |
US11768186B2 (en) | 2020-12-08 | 2023-09-26 | Hyaxiom, Inc. | Hydrogen concentration sensor |
US20220178870A1 (en) * | 2020-12-08 | 2022-06-09 | Doosan Fuel Cell America, Inc. | Hydrogen concentration sensor |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3012086A (en) * | 1957-07-17 | 1961-12-05 | Allis Chalmers Mfg Co | Fuel cell |
US3507704A (en) * | 1967-05-17 | 1970-04-21 | Webb James E | Electrolytically regenerative hydrogen-oxygen fuel cell |
US3575719A (en) * | 1968-10-09 | 1971-04-20 | Allis Chalmers Mfg Co | Compact cell construction |
DE1945945C3 (de) * | 1969-09-11 | 1978-09-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Brennstoffbatterie zur Umsetzung eines im Elektrolyten gelösten Reaktanten |
US4175165A (en) * | 1977-07-20 | 1979-11-20 | Engelhard Minerals & Chemicals Corporation | Fuel cell system utilizing ion exchange membranes and bipolar plates |
US4279970A (en) * | 1980-02-20 | 1981-07-21 | Electric Power Research Institute, Inc. | Electrochemical cell including ribbed electrode substrates |
JPS58119172A (ja) * | 1982-01-08 | 1983-07-15 | Toshiba Corp | 燃料電池装置 |
US4588661A (en) * | 1984-08-27 | 1986-05-13 | Engelhard Corporation | Fabrication of gas impervious edge seal for a bipolar gas distribution assembly for use in a fuel cell |
JPS62136777A (ja) * | 1986-04-04 | 1987-06-19 | Kansai Electric Power Co Inc:The | 燃料電池のセルスタツク |
US4804592A (en) * | 1987-10-16 | 1989-02-14 | The United States Of America As Represented By The United States Department Of Energy | Composite electrode for use in electrochemical cells |
US4978590A (en) * | 1989-09-11 | 1990-12-18 | The United States Of America As Represented By The Department Of Energy | Dry compliant seal for phosphoric acid fuel cell |
US5176966A (en) * | 1990-11-19 | 1993-01-05 | Ballard Power Systems Inc. | Fuel cell membrane electrode and seal assembly |
US5230966A (en) * | 1991-09-26 | 1993-07-27 | Ballard Power Systems Inc. | Coolant flow field plate for electrochemical fuel cells |
US5284718A (en) * | 1991-09-27 | 1994-02-08 | Ballard Power Systems Inc. | Fuel cell membrane electrode and seal assembly |
-
1991
- 1991-09-27 US US07/766,745 patent/US5284718A/en not_active Expired - Lifetime
-
1992
- 1992-10-20 WO PCT/US1992/008222 patent/WO1994009520A1/en active IP Right Grant
- 1992-10-20 AU AU30541/92A patent/AU675415B2/en not_active Ceased
- 1992-10-20 EP EP92924101A patent/EP0665984B1/de not_active Expired - Lifetime
- 1992-10-20 JP JP06509924A patent/JP3045316B2/ja not_active Expired - Fee Related
- 1992-10-20 DE DE69221330T patent/DE69221330T2/de not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010028957A1 (de) * | 2010-05-12 | 2011-11-17 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Brennstoffzellenstapel und Verfahren zum Herstellen eines Brennstoffzellenstapels |
Also Published As
Publication number | Publication date |
---|---|
JP3045316B2 (ja) | 2000-05-29 |
EP0665984A4 (de) | 1995-11-29 |
DE69221330D1 (de) | 1997-09-04 |
EP0665984B1 (de) | 1997-07-30 |
JPH08507403A (ja) | 1996-08-06 |
EP0665984A1 (de) | 1995-08-09 |
US5284718A (en) | 1994-02-08 |
WO1994009520A1 (en) | 1994-04-28 |
AU3054192A (en) | 1994-05-09 |
AU675415B2 (en) | 1997-02-06 |
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