FR2414031A1 - Procede de fabrication d'un corps de diamant polycristallin et corps ainsi obtenu - Google Patents
Procede de fabrication d'un corps de diamant polycristallin et corps ainsi obtenuInfo
- Publication number
- FR2414031A1 FR2414031A1 FR7829911A FR7829911A FR2414031A1 FR 2414031 A1 FR2414031 A1 FR 2414031A1 FR 7829911 A FR7829911 A FR 7829911A FR 7829911 A FR7829911 A FR 7829911A FR 2414031 A1 FR2414031 A1 FR 2414031A1
- Authority
- FR
- France
- Prior art keywords
- manufacturing
- mass
- polycrystalline diamond
- pressure transmission
- diamond crystals
- 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
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
- C04B35/645—Pressure sintering
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- 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
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
- B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
- C04B35/6316—Binders based on silicon compounds
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- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0605—Composition of the material to be processed
- B01J2203/062—Diamond
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- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/065—Composition of the material produced
- B01J2203/0655—Diamond
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- 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
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0675—Structural or physico-chemical features of the materials processed
- B01J2203/0685—Crystal sintering
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/427—Diamond
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/608—Green bodies or pre-forms with well-defined density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/616—Liquid infiltration of green bodies or pre-forms
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6587—Influencing the atmosphere by vaporising a solid material, e.g. by using a burying of sacrificial powder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B2235/721—Carbon content
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B2235/728—Silicon content
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Ceramic Products (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
PROCEDE UTILISANT DES PRESSIONS ET DES TEMPERATURES PEU ELEVEES. IL CONSISTE A FORMER UNE CAVITE 9 DE TAILLE PREDETERMINEE DANS UNE POUDRE DE TRANSMISSION DE LA PRESSION 19, A Y PLACER UNE MASSE DE CRISTAUX DE DIAMANT 13 EN CONTACT AVEC UNE MASSE DE SILICIUM 12, A RECOUVRIR AVEC DE LA POUDRE DE TRANSMISSION DE PRESSION SUPPLEMENTAIRE, A PRESSER A FROID L'ENSEMBLE POUR FORMER UN SYSTEME FACONNE, STABILISE EN DIMENSION ET A PRESSER A CHAUD LE SYSTEME POUR LIQUEFIER ET FAIRE S'INFILTRER LE SILICIUM DANS LES INTERSTICES ENTRE LES CRISTAUX DE DIAMANT. APPLICATION A LA FABRICATION D'OUTILS DE COUPE.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84444677A | 1977-10-21 | 1977-10-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2414031A1 true FR2414031A1 (fr) | 1979-08-03 |
FR2414031B1 FR2414031B1 (fr) | 1985-11-08 |
Family
ID=25292734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7829911A Expired FR2414031B1 (fr) | 1977-10-21 | 1978-10-20 | Procede de fabrication d'un corps de diamant polycristallin et corps ainsi obtenu |
Country Status (20)
Country | Link |
---|---|
JP (1) | JPS5485212A (fr) |
AT (1) | AT371401B (fr) |
AU (1) | AU526018B2 (fr) |
BE (1) | BE871433A (fr) |
BR (1) | BR7806952A (fr) |
CA (1) | CA1105948A (fr) |
CH (1) | CH644090A5 (fr) |
DE (1) | DE2845755A1 (fr) |
DK (1) | DK154824C (fr) |
ES (1) | ES474328A1 (fr) |
FR (1) | FR2414031B1 (fr) |
GB (1) | GB2006732B (fr) |
IE (1) | IE47959B1 (fr) |
IL (1) | IL55718A0 (fr) |
IN (1) | IN150647B (fr) |
IT (1) | IT1101661B (fr) |
MX (1) | MX151724A (fr) |
NL (1) | NL186380C (fr) |
SE (1) | SE451378B (fr) |
ZA (1) | ZA785931B (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4220455A (en) * | 1978-10-24 | 1980-09-02 | General Electric Company | Polycrystalline diamond and/or cubic boron nitride body and process for making said body |
AU7919682A (en) * | 1981-01-21 | 1982-07-29 | General Electric Company | Silicon carbide-diamond/boron nitride composite |
AT386558B (de) * | 1984-03-30 | 1988-09-12 | De Beers Ind Diamond | Verwendung eines schleifwerkzeuges |
US4874398A (en) * | 1984-08-24 | 1989-10-17 | Ringwood Alfred E | Diamond compacts and process for making same |
IE57439B1 (en) * | 1985-04-09 | 1992-09-09 | De Beers Ind Diamond | Wire drawing die |
ZA864402B (en) * | 1985-06-18 | 1987-02-25 | De Beers Ind Diamond | Abrasive tool |
WO1988007409A1 (fr) * | 1987-03-23 | 1988-10-06 | The Australian National University | Agglomeres de diamant |
WO1990001986A1 (fr) * | 1988-08-17 | 1990-03-08 | The Australian National University | Agglomere compact diamante presentant une faible resistivite electrique |
CN110125390A (zh) * | 2018-02-08 | 2019-08-16 | 罗天珍 | 三维打印金属粉末粘结毛坯的填充压实烧结工艺 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3239321A (en) * | 1960-07-22 | 1966-03-08 | Adamant Res Lab | Diamond abrasive particles in a metal matrix |
US3912500A (en) * | 1972-12-27 | 1975-10-14 | Leonid Fedorovich Vereschagin | Process for producing diamond-metallic materials |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2391589A (en) * | 1943-04-29 | 1945-12-25 | Hatim Attari | Abrasive tool |
CA1070123A (fr) * | 1969-04-17 | 1980-01-22 | Howard T. Hall | Meules au diamant |
US3913280A (en) * | 1971-01-29 | 1975-10-21 | Megadiamond Corp | Polycrystalline diamond composites |
US4042347A (en) * | 1974-04-15 | 1977-08-16 | Norton Company | Method of making a resin-metal composite grinding wheel |
-
1978
- 1978-09-19 IN IN1027/CAL/78A patent/IN150647B/en unknown
- 1978-10-05 GB GB7839448A patent/GB2006732B/en not_active Expired
- 1978-10-05 CA CA312,780A patent/CA1105948A/fr not_active Expired
- 1978-10-12 IL IL7855718A patent/IL55718A0/xx not_active IP Right Cessation
- 1978-10-18 ES ES474328A patent/ES474328A1/es not_active Expired
- 1978-10-19 IT IT28922/78A patent/IT1101661B/it active
- 1978-10-20 CH CH1089878A patent/CH644090A5/de not_active IP Right Cessation
- 1978-10-20 DE DE19782845755 patent/DE2845755A1/de active Granted
- 1978-10-20 DK DK468778A patent/DK154824C/da not_active IP Right Cessation
- 1978-10-20 IE IE2086/78A patent/IE47959B1/en not_active IP Right Cessation
- 1978-10-20 ZA ZA00785931A patent/ZA785931B/xx unknown
- 1978-10-20 NL NLAANVRAGE7810522,A patent/NL186380C/xx not_active IP Right Cessation
- 1978-10-20 BE BE191262A patent/BE871433A/fr not_active IP Right Cessation
- 1978-10-20 SE SE7810970A patent/SE451378B/sv not_active IP Right Cessation
- 1978-10-20 JP JP12993878A patent/JPS5485212A/ja active Granted
- 1978-10-20 BR BR7806952A patent/BR7806952A/pt unknown
- 1978-10-20 FR FR7829911A patent/FR2414031B1/fr not_active Expired
- 1978-10-20 AT AT0754078A patent/AT371401B/de not_active IP Right Cessation
- 1978-10-23 MX MX175339A patent/MX151724A/es unknown
- 1978-10-30 AU AU41175/78A patent/AU526018B2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3239321A (en) * | 1960-07-22 | 1966-03-08 | Adamant Res Lab | Diamond abrasive particles in a metal matrix |
US3912500A (en) * | 1972-12-27 | 1975-10-14 | Leonid Fedorovich Vereschagin | Process for producing diamond-metallic materials |
Also Published As
Publication number | Publication date |
---|---|
GB2006732A (en) | 1979-05-10 |
ES474328A1 (es) | 1979-11-01 |
JPS5485212A (en) | 1979-07-06 |
IT1101661B (it) | 1985-10-07 |
IL55718A0 (fr) | 1978-12-17 |
AU526018B2 (en) | 1982-12-16 |
IT7828922A0 (it) | 1978-10-19 |
DK468778A (da) | 1979-04-22 |
DE2845755A1 (de) | 1979-05-10 |
AU4117578A (en) | 1980-05-08 |
SE7810970L (sv) | 1979-04-22 |
AT371401B (de) | 1983-06-27 |
IE47959B1 (en) | 1984-08-08 |
NL186380C (nl) | 1990-11-16 |
IN150647B (fr) | 1982-11-20 |
IE782086L (en) | 1979-04-21 |
FR2414031B1 (fr) | 1985-11-08 |
BR7806952A (pt) | 1979-05-08 |
SE451378B (sv) | 1987-10-05 |
MX151724A (es) | 1985-02-18 |
JPS6213305B2 (fr) | 1987-03-25 |
CH644090A5 (de) | 1984-07-13 |
GB2006732B (en) | 1982-10-20 |
DK154824C (da) | 1989-05-29 |
DK154824B (da) | 1988-12-27 |
ATA754078A (de) | 1982-11-15 |
NL186380B (nl) | 1990-06-18 |
ZA785931B (en) | 1979-09-26 |
CA1105948A (fr) | 1981-07-28 |
DE2845755C2 (fr) | 1989-09-14 |
NL7810522A (nl) | 1979-04-24 |
BE871433A (fr) | 1979-04-20 |
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