FR2530866B1 - NOVEL SEMICONDUCTOR DEVICE AND METHOD FOR ITS PREPARATION - Google Patents

NOVEL SEMICONDUCTOR DEVICE AND METHOD FOR ITS PREPARATION

Info

Publication number
FR2530866B1
FR2530866B1 FR8313542A FR8313542A FR2530866B1 FR 2530866 B1 FR2530866 B1 FR 2530866B1 FR 8313542 A FR8313542 A FR 8313542A FR 8313542 A FR8313542 A FR 8313542A FR 2530866 B1 FR2530866 B1 FR 2530866B1
Authority
FR
France
Prior art keywords
preparation
semiconductor device
novel semiconductor
novel
semiconductor
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
Application number
FR8313542A
Other languages
French (fr)
Other versions
FR2530866A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stauffer Chemical Co
Original Assignee
Stauffer Chemical Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/419,537 external-priority patent/US4620968A/en
Priority claimed from US06/442,208 external-priority patent/US4508931A/en
Application filed by Stauffer Chemical Co filed Critical Stauffer Chemical Co
Publication of FR2530866A1 publication Critical patent/FR2530866A1/en
Application granted granted Critical
Publication of FR2530866B1 publication Critical patent/FR2530866B1/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/0248Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
    • H01L31/0256Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
    • H01L31/0264Inorganic materials
    • H01L31/032Inorganic materials including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/003Phosphorus
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/02Preparation of phosphorus
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/04Purification of phosphorus
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/08Other phosphides
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/08Other phosphides
    • C01B25/081Other phosphides of alkali metals, alkaline-earth metals or magnesium
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/08Other phosphides
    • C01B25/088Other phosphides containing plural metal
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/22Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K21/00Fireproofing materials
    • C09K21/02Inorganic materials
    • C09K21/04Inorganic materials containing phosphorus
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/54Controlling or regulating the coating process
    • C23C14/541Heating or cooling of the substrates
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B23/00Single-crystal growth by condensing evaporated or sublimed materials
    • C30B23/02Epitaxial-layer growth
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B25/00Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
    • C30B25/02Epitaxial-layer growth
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10Inorganic compounds or compositions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof  ; Multistep manufacturing processes therefor
    • H01L29/02Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/12Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/24Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only semiconductor materials not provided for in groups H01L29/16, H01L29/18, H01L29/20, H01L29/22
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/20Materials for coating a single layer on glass
    • C03C2217/28Other inorganic materials
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/20Materials for coating a single layer on glass
    • C03C2217/28Other inorganic materials
    • C03C2217/283Borides, phosphides
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00Coatings on glass
    • C03C2217/20Materials for coating a single layer on glass
    • C03C2217/29Mixtures
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00Methods for coating glass
    • C03C2218/10Deposition methods
    • C03C2218/15Deposition methods from the vapour phase
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K10/00Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
    • H10K10/40Organic transistors
    • H10K10/46Field-effect transistors, e.g. organic thin-film transistors [OTFT]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K10/00Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
    • H10K10/40Organic transistors
    • H10K10/46Field-effect transistors, e.g. organic thin-film transistors [OTFT]
    • H10K10/462Insulated gate field-effect transistors [IGFETs]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/549Organic PV cells
FR8313542A 1981-12-30 1983-08-22 NOVEL SEMICONDUCTOR DEVICE AND METHOD FOR ITS PREPARATION Expired FR2530866B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US33570681A 1981-12-30 1981-12-30
US06/419,537 US4620968A (en) 1981-12-30 1982-09-17 Monoclinic phosphorus formed from vapor in the presence of an alkali metal
US06/442,208 US4508931A (en) 1981-12-30 1982-11-16 Catenated phosphorus materials, their preparation and use, and semiconductor and other devices employing them

Publications (2)

Publication Number Publication Date
FR2530866A1 FR2530866A1 (en) 1984-01-27
FR2530866B1 true FR2530866B1 (en) 1985-07-12

Family

ID=27407080

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8313542A Expired FR2530866B1 (en) 1981-12-30 1983-08-22 NOVEL SEMICONDUCTOR DEVICE AND METHOD FOR ITS PREPARATION

Country Status (23)

Country Link
JP (1) JPH0611644B2 (en)
KR (1) KR840003144A (en)
AU (1) AU553091B2 (en)
BR (1) BR8207569A (en)
CA (1) CA1215521A (en)
CH (3) CH663609A5 (en)
DE (1) DE3247869A1 (en)
DK (1) DK578782A (en)
ES (2) ES8406000A1 (en)
FR (1) FR2530866B1 (en)
GB (2) GB2113663B (en)
GR (1) GR78374B (en)
HK (2) HK38288A (en)
IE (1) IE53683B1 (en)
IL (1) IL67565A0 (en)
IT (1) IT1210712B (en)
MA (1) MA19673A1 (en)
NL (1) NL8205055A (en)
NO (1) NO824406L (en)
PL (1) PL239879A1 (en)
PT (1) PT76047B (en)
SE (4) SE8207299L (en)
SG (1) SG97687G (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247349A (en) * 1982-11-16 1993-09-21 Stauffer Chemical Company Passivation and insulation of III-V devices with pnictides, particularly amorphous pnictides having a layer-like structure
AU2992784A (en) * 1983-06-29 1985-01-03 Stauffer Chemical Company Passivation and insulation of iii-v devices with pnictides
AU2993784A (en) * 1984-02-17 1985-08-22 Stauffer Chemical Company Vacuum deposition of pnictides
DK318184A (en) * 1984-02-17 1985-08-18 Stauffer Chemical Co HIGH-VACUUM DISPOSAL PROCESSES USING A CONTINUOUS PNIC TIME DELIVERY SYSTEM
AU2993684A (en) * 1984-02-17 1985-08-22 Stauffer Chemical Company Vapour deposition of pnictides
GB9010000D0 (en) * 1990-05-03 1990-06-27 Stc Plc Phosphide films
JP4958076B2 (en) * 2008-01-25 2012-06-20 住友電気工業株式会社 Method for analyzing red phosphorus in resin composition
GB201601838D0 (en) 2016-02-02 2016-03-16 Univ Surrey A composition
KR102307523B1 (en) * 2019-10-30 2021-09-30 울산과학기술원 Manufacuring method for polyphosphide precursor, manufacuring method for crystalline red phosphorus thin film and electronic device application
CN111170292B (en) * 2019-11-04 2023-09-29 湖北大学 Preparation method and application of fiber phase red phosphorus nano particles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397038A (en) * 1964-11-30 1968-08-13 Hooker Chemical Corp Manufacture of a reactive trisodium phosphide
FR2419585A1 (en) * 1978-03-07 1979-10-05 Thomson Csf PROCESS FOR OBTAINING IN THE GASEOUS PHASE OF AN EPITAXIAL LAYER OF INDIUM PHOSPHIDE, AND APPARATUS FOR APPLYING THIS PROCESS
US4217374A (en) * 1978-03-08 1980-08-12 Energy Conversion Devices, Inc. Amorphous semiconductors equivalent to crystalline semiconductors
GB2055774B (en) * 1979-04-09 1983-02-02 Plessey Co Ltd Methods of producing semiconductor materials

Also Published As

Publication number Publication date
ES518662A0 (en) 1984-06-16
SE8401509D0 (en) 1984-03-19
BR8207569A (en) 1983-10-25
NL8205055A (en) 1983-07-18
SE8207299D0 (en) 1982-12-21
DE3247869A1 (en) 1983-08-18
GB8516583D0 (en) 1985-08-07
GB2172585B (en) 1987-01-28
ES530659A0 (en) 1985-10-01
JPH05201712A (en) 1993-08-10
AU9158882A (en) 1983-07-07
IT1210712B (en) 1989-09-20
MA19673A1 (en) 1983-07-01
CH666252A5 (en) 1988-07-15
JPH0611644B2 (en) 1994-02-16
GR78374B (en) 1984-09-26
SE8401509L (en) 1984-03-19
SE8401510D0 (en) 1984-03-19
NO824406L (en) 1983-07-01
PT76047B (en) 1985-11-18
SE8401511D0 (en) 1984-03-19
CH672778A5 (en) 1989-12-29
ES8600164A1 (en) 1985-10-01
HK38288A (en) 1988-06-03
SE8401511L (en) 1984-03-19
GB2113663A (en) 1983-08-10
KR840003144A (en) 1984-08-13
IL67565A0 (en) 1983-05-15
CH663609A5 (en) 1987-12-31
SE8401510L (en) 1984-03-19
PL239879A1 (en) 1984-03-26
SE8207299L (en) 1983-07-01
PT76047A (en) 1983-01-01
FR2530866A1 (en) 1984-01-27
IE53683B1 (en) 1989-01-04
DK578782A (en) 1983-07-01
AU553091B2 (en) 1986-07-03
CA1215521A (en) 1986-12-23
IE823057L (en) 1983-06-30
ES8406000A1 (en) 1984-06-16
GB2113663B (en) 1986-10-29
SG97687G (en) 1988-06-03
IT8249774A0 (en) 1982-12-30
GB2172585A (en) 1986-09-24
HK38188A (en) 1988-06-03

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