EG13886A - Nobel metal refractory metal alloys and method for making - Google Patents
Nobel metal refractory metal alloys and method for makingInfo
- Publication number
- EG13886A EG13886A EG399/79A EG39979A EG13886A EG 13886 A EG13886 A EG 13886A EG 399/79 A EG399/79 A EG 399/79A EG 39979 A EG39979 A EG 39979A EG 13886 A EG13886 A EG 13886A
- Authority
- EG
- Egypt
- Prior art keywords
- making
- nobel
- metal
- alloys
- refractory metal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/928—Unsupported catalytic particles; loose particulate catalytic materials, e.g. in fluidised state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/925—Metals of platinum group supported on carriers, e.g. powder carriers
- H01M4/926—Metals of platinum group supported on carriers, e.g. powder carriers on carbon or graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8684—Negative electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8689—Positive electrodes
-
- 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
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid 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
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid electrolytes
- H01M2300/0008—Phosphoric acid-based
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/921—Alloys or mixtures with metallic elements
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Inert Electrodes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/922,004 US4186110A (en) | 1978-07-03 | 1978-07-03 | Noble metal-refractory metal alloys as catalysts and method for making |
Publications (1)
Publication Number | Publication Date |
---|---|
EG13886A true EG13886A (en) | 1982-09-30 |
Family
ID=25446324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EG399/79A EG13886A (en) | 1978-07-03 | 1979-07-02 | Nobel metal refractory metal alloys and method for making |
Country Status (16)
Country | Link |
---|---|
US (1) | US4186110A (fr) |
JP (1) | JPS5916495B2 (fr) |
AU (1) | AU527322B2 (fr) |
BE (1) | BE877414A (fr) |
BR (1) | BR7904198A (fr) |
CA (1) | CA1123417A (fr) |
CH (1) | CH645037A5 (fr) |
DE (1) | DE2926615A1 (fr) |
DK (1) | DK150707C (fr) |
EG (1) | EG13886A (fr) |
FR (1) | FR2430264A1 (fr) |
GB (1) | GB2024868B (fr) |
IL (1) | IL57702A (fr) |
IT (1) | IT1121991B (fr) |
NL (1) | NL7905122A (fr) |
SE (1) | SE445611B (fr) |
Families Citing this family (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4316944A (en) * | 1980-06-18 | 1982-02-23 | United Technologies Corporation | Noble metal-chromium alloy catalysts and electrochemical cell |
US4437926A (en) | 1980-07-07 | 1984-03-20 | Regie Nationale Des Usines Renault | Metal alloy with high catalytic activity |
US4383940A (en) * | 1980-12-05 | 1983-05-17 | Phillips Petroleum Company | Catalysts for hydrogenation of unsaturated dinitriles |
US4822699A (en) * | 1982-12-20 | 1989-04-18 | Engelhard Corporation | Electrocatalyst and fuel cell electrode using the same |
US4457986A (en) * | 1982-12-30 | 1984-07-03 | International Business Machines Corporation | Use of underpotential deposited layers of metals on foreign metal substrates as catalysts for electrolytic cells |
US4447506A (en) * | 1983-01-17 | 1984-05-08 | United Technologies Corporation | Ternary fuel cell catalysts containing platinum, cobalt and chromium |
US5079107A (en) * | 1984-06-07 | 1992-01-07 | Giner, Inc. | Cathode alloy electrocatalysts |
JPS62163746A (ja) * | 1986-01-13 | 1987-07-20 | Nippon Engeruharudo Kk | 白金合金電極触媒およびそれを使用した酸電解質燃料電池用電極 |
JPS62269751A (ja) * | 1986-05-16 | 1987-11-24 | Nippon Engeruharudo Kk | 白金−銅合金電極触媒およびそれを使用した酸電解質燃料電池用電極 |
JP2977199B2 (ja) * | 1988-01-22 | 1999-11-10 | 田中貴金属工業株式会社 | 電極触媒 |
US5246791A (en) * | 1988-07-06 | 1993-09-21 | Johnson Matthey Public Limited Company | Fuel cell containing a reforming catalyst |
US4937220A (en) * | 1988-08-08 | 1990-06-26 | International Fuel Cells Corporation | Method to retard catalyst recrystallization |
CA2016517C (fr) * | 1989-05-11 | 1999-01-12 | Dale R. Shackle | Cellule electrochimique a semiconducteur a collecteur de courant a microrugosite |
US5068161A (en) * | 1990-03-30 | 1991-11-26 | Johnson Matthey Public Limited Company | Catalyst material |
US5126216A (en) * | 1990-11-27 | 1992-06-30 | Universite Du Quebec A Montreal | Ternary alloy electrocatalysts |
US5183713A (en) * | 1991-01-17 | 1993-02-02 | International Fuel Cells Corporation | Carbon monoxide tolerant platinum-tantalum alloyed catalyst |
DE19517598C1 (de) * | 1995-05-13 | 1997-01-02 | Degussa | Platin-Aluminium-Legierungskatalysator und dessen Verwendung in Brennstoffzellen |
JP3903598B2 (ja) * | 1997-09-24 | 2007-04-11 | トヨタ自動車株式会社 | 排ガス浄化用触媒およびその製造方法 |
US6297185B1 (en) * | 1998-02-23 | 2001-10-02 | T/J Technologies, Inc. | Catalyst |
US6417133B1 (en) | 1998-02-25 | 2002-07-09 | Monsanto Technology Llc | Deeply reduced oxidation catalyst and its use for catalyzing liquid phase oxidation reactions |
US6284402B1 (en) * | 1998-06-05 | 2001-09-04 | The Penn State Research Foundation | Electrocatalyst compositions |
US6239065B1 (en) * | 1998-12-22 | 2001-05-29 | Hydro-Quebec | Process for the preparation of a supported catalyst |
US7015351B2 (en) * | 2000-05-22 | 2006-03-21 | Monsanto Technology Llc | Reaction systems for making N-(phosphonomethyl) glycine compounds |
JP3783530B2 (ja) * | 2000-06-22 | 2006-06-07 | ヤマハ株式会社 | 光酸化触媒 |
DE10059743A1 (de) * | 2000-12-01 | 2002-06-20 | Rolf Hempelmann | Verfahren zur Katalysatorabscheidung |
EP1236509A1 (fr) * | 2001-02-23 | 2002-09-04 | Degussa Aktiengesellschaft | Noir de carbone traité avec un métal précieux catalytique |
ATE309861T1 (de) * | 2001-02-23 | 2005-12-15 | Umicore Ag & Co Kg | Verfahren zur herstellung einer elektrokatalytischen verbindung |
JP2008100227A (ja) * | 2001-06-01 | 2008-05-01 | Sony Corp | 導電性触媒粒子及びその製造方法、ガス拡散性触媒電極及び電気化学デバイス |
US6670300B2 (en) | 2001-06-18 | 2003-12-30 | Battelle Memorial Institute | Textured catalysts, methods of making textured catalysts, and methods of catalyzing reactions conducted in hydrothermal conditions |
JP4963147B2 (ja) * | 2001-09-17 | 2012-06-27 | 株式会社豊田中央研究所 | 燃料電池用電極触媒体およびその製造方法 |
US20070054802A1 (en) * | 2003-05-27 | 2007-03-08 | Symyx Technolgies, Inc. | Platinum-vanadium-iron fuel cell electrocatalyst |
WO2005024982A2 (fr) * | 2003-08-18 | 2005-03-17 | Symyx Technologies, Inc. | Catalyseur au platine-cuivre pour pile a combustible |
JP4463522B2 (ja) * | 2003-10-16 | 2010-05-19 | 日揮触媒化成株式会社 | 電極の触媒用微粒子および該電極触媒用微粒子分散液、該電極触媒用微粒子分散液の製造方法 |
JPWO2005120703A1 (ja) * | 2004-06-10 | 2008-04-03 | 住友電気工業株式会社 | 金属触媒とその製造方法 |
WO2006031938A2 (fr) * | 2004-09-15 | 2006-03-23 | Monsanto Technology Llc | Catalyseur d'oxydation et son utilisation dans la catalyse de reactions d'oxydation a phase liquide |
US7736790B2 (en) | 2004-12-06 | 2010-06-15 | Honda Motor Co., Ltd. | Platinum and tungsten containing electrocatalysts |
US7718309B2 (en) | 2004-12-06 | 2010-05-18 | Honda Motor Co., Ltd. | Platinum and tungsten containing electrocatalysts |
US20070037696A1 (en) * | 2005-01-24 | 2007-02-15 | Symyx Technologies, Inc. | Platinum-palladium-titanium fuel cell catalyst |
US20080044719A1 (en) * | 2005-02-02 | 2008-02-21 | Symyx Technologies, Inc. | Platinum-copper-titanium fuel cell catalyst |
US7732080B2 (en) * | 2005-04-25 | 2010-06-08 | Uchicago Argonne, Llc | Catalytic membranes for CO oxidation in fuel cells |
US7435504B2 (en) * | 2005-08-25 | 2008-10-14 | Honda Motor Co., Ltd. | Platinum, tungsten, and nickel or zirconium containing electrocatalysts |
KR100757585B1 (ko) * | 2005-12-12 | 2007-09-10 | 현대자동차주식회사 | 고분산 백금 담지 촉매의 제조방법 |
US7740975B2 (en) * | 2006-01-06 | 2010-06-22 | Honda Motor Co., Ltd. | Platinum and titanium containing electrocatalysts |
US7318977B2 (en) * | 2006-01-06 | 2008-01-15 | Honda Motor Co., Ltd. | Platinum and titanium containing electrocatalysts |
US7691522B2 (en) * | 2006-03-09 | 2010-04-06 | Honda Motor Co., Ltd. | Platinum, titanium and copper, manganese and iron containing electrocatalysts |
US7704628B2 (en) * | 2006-05-08 | 2010-04-27 | Honda Motor Co., Ltd. | Platinum, titanium, cobalt and palladium containing electrocatalysts |
US20070160899A1 (en) * | 2006-01-10 | 2007-07-12 | Cabot Corporation | Alloy catalyst compositions and processes for making and using same |
KR100738062B1 (ko) * | 2006-05-16 | 2007-07-10 | 삼성에스디아이 주식회사 | 막 전극 접합체 및 이를 이용한 연료전지 |
KR100846478B1 (ko) * | 2006-05-16 | 2008-07-17 | 삼성에스디아이 주식회사 | 담지 촉매, 그 제조방법 및 이를 이용한 연료전지 |
US7842639B2 (en) * | 2006-05-19 | 2010-11-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Mechanical alloying of a hydrogenation catalyst used for the remediation of contaminated compounds |
KR101350865B1 (ko) * | 2006-07-24 | 2014-01-13 | 주식회사 동진쎄미켐 | 연료전지용 담지 촉매 및 그 제조방법, 상기 담지 촉매를포함하는 연료전지용 전극, 상기 전극을 포함하는 막전극접합체 및 상기 막전극 접합체를 포함하는 연료전지 |
KR101149408B1 (ko) * | 2006-11-15 | 2012-06-01 | 삼성전자주식회사 | 연료 전지용 전극의 제조 방법 및 제조 장치 |
US8383293B2 (en) * | 2006-11-22 | 2013-02-26 | GM Global Technology Operations LLC | Supports for fuel cell catalysts based on transition metal silicides |
KR101397020B1 (ko) * | 2007-11-20 | 2014-05-21 | 삼성에스디아이 주식회사 | 연료전지용 전극촉매, 그 제조방법, 상기 전극촉매를포함하는 전극을 구비한 연료전지 |
KR20100116623A (ko) * | 2008-02-19 | 2010-11-01 | 캐보트 코포레이션 | 메조기공성 탄소 블랙 및 그의 제조 방법 |
US9017837B2 (en) | 2008-02-19 | 2015-04-28 | Cabot Corporation | High surface area graphitized carbon and processes for making same |
US8252953B2 (en) | 2008-05-01 | 2012-08-28 | Monsanto Technology Llc | Metal utilization in supported, metal-containing catalysts |
JP2016506019A (ja) | 2012-11-21 | 2016-02-25 | ダンマークス テクニスク ユニバーシテット | 燃料電池電極として好適な白金およびパラジウム合金 |
US9359681B1 (en) * | 2013-03-11 | 2016-06-07 | Alexey Serov | CO2 electroreduction on metals and metal alloys prepared by a sacrificial support-based method |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2384501A (en) * | 1942-02-02 | 1945-09-11 | American Platinum Works | Platinum metal catalysts and the manufacture thereof |
LU28048A1 (fr) * | 1942-02-07 | |||
US3085876A (en) * | 1960-03-01 | 1963-04-16 | Du Pont | Process for dispersing a refractory metal oxide in another metal |
US3428490A (en) * | 1962-08-29 | 1969-02-18 | Sun Oil Co | Noble metal aluminum alloys as catalysts for fuel cell electrodes |
DE1287051B (de) * | 1962-09-07 | 1969-01-16 | Bosch Gmbh Robert | Verfahren zur Herstellung von poroesen Gasdiffusionselektroden mit Raney-Katalysatoren |
US3340097A (en) * | 1964-01-22 | 1967-09-05 | Air Prod & Chem | Fuel cell electrode having surface co-deposit of platinum, tin and ruthenium |
US3481787A (en) * | 1964-06-11 | 1969-12-02 | Engelhard Ind Inc | Fuel cell comprising a raney catalyst alloy consisting of platinum and a member selected from the group consisting of zirconium,tungsten and rhenium |
US3424619A (en) * | 1964-09-28 | 1969-01-28 | Engelhard Ind Inc | Process for using fuel cell with hydrocarbon fuel and platinum-niobium alloy catalyst |
US3506494A (en) * | 1966-12-22 | 1970-04-14 | Engelhard Ind Inc | Process for producing electrical energy utilizing platinum-containing catalysts |
US3433680A (en) * | 1967-01-31 | 1969-03-18 | Us Interior | Platinum type electrode for a solid electrolyte fuel cell |
US3414439A (en) * | 1967-03-13 | 1968-12-03 | Engelhard Ind Inc | Fuel cell and process of using with ruthenium-tantalum alloy catalyst |
US3989515A (en) * | 1972-02-11 | 1976-11-02 | Carl Haas | Alloys for tension bands |
GB1456369A (en) * | 1972-11-30 | 1976-11-24 | Stamicarbon | Catalyst preparation |
NL7502841A (nl) * | 1975-03-11 | 1976-09-14 | Stamicarbon | Werkwijze voor het vervaardigen van een metaal- elektrode. |
US4053566A (en) * | 1975-09-30 | 1977-10-11 | Thiokol Corporation | Method of making diammonium hydrazinium tetraperchlorate |
LU76107A1 (fr) * | 1976-10-29 | 1978-05-16 |
-
1978
- 1978-07-03 US US05/922,004 patent/US4186110A/en not_active Expired - Lifetime
-
1979
- 1979-06-18 CA CA329,946A patent/CA1123417A/fr not_active Expired
- 1979-06-25 SE SE7905541A patent/SE445611B/sv not_active IP Right Cessation
- 1979-07-02 EG EG399/79A patent/EG13886A/xx active
- 1979-07-02 NL NL7905122A patent/NL7905122A/nl not_active Application Discontinuation
- 1979-07-02 IL IL57702A patent/IL57702A/xx unknown
- 1979-07-02 FR FR7917113A patent/FR2430264A1/fr active Granted
- 1979-07-02 DE DE19792926615 patent/DE2926615A1/de active Granted
- 1979-07-02 BR BR7904198A patent/BR7904198A/pt unknown
- 1979-07-02 BE BE0/196079A patent/BE877414A/fr not_active IP Right Cessation
- 1979-07-02 CH CH614979A patent/CH645037A5/de not_active IP Right Cessation
- 1979-07-02 DK DK280279A patent/DK150707C/da not_active IP Right Cessation
- 1979-07-02 GB GB7922932A patent/GB2024868B/en not_active Expired
- 1979-07-02 IT IT24031/79A patent/IT1121991B/it active
- 1979-07-03 AU AU48607/79A patent/AU527322B2/en not_active Ceased
- 1979-07-03 JP JP54084876A patent/JPS5916495B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT7924031A0 (it) | 1979-07-02 |
NL7905122A (nl) | 1980-01-07 |
AU4860779A (en) | 1980-02-07 |
DK150707C (da) | 1988-01-25 |
DK280279A (da) | 1980-01-04 |
DK150707B (da) | 1987-06-01 |
GB2024868A (en) | 1980-01-16 |
JPS5916495B2 (ja) | 1984-04-16 |
AU527322B2 (en) | 1983-02-24 |
FR2430264A1 (fr) | 1980-02-01 |
SE7905541L (sv) | 1980-01-04 |
FR2430264B1 (fr) | 1985-03-22 |
CA1123417A (fr) | 1982-05-11 |
JPS5524595A (en) | 1980-02-21 |
US4186110A (en) | 1980-01-29 |
SE445611B (sv) | 1986-07-07 |
BR7904198A (pt) | 1980-04-29 |
BE877414A (fr) | 1979-11-05 |
IT1121991B (it) | 1986-04-23 |
GB2024868B (en) | 1982-08-25 |
DE2926615A1 (de) | 1980-01-24 |
IL57702A0 (en) | 1979-11-30 |
IL57702A (en) | 1982-08-31 |
CH645037A5 (de) | 1984-09-14 |
DE2926615C2 (fr) | 1989-07-06 |
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