FR2313161A1 - Pieces faconnees en metal dur, notamment pour la realisation de plaques de coupe - Google Patents

Pieces faconnees en metal dur, notamment pour la realisation de plaques de coupe

Info

Publication number
FR2313161A1
FR2313161A1 FR7616786A FR7616786A FR2313161A1 FR 2313161 A1 FR2313161 A1 FR 2313161A1 FR 7616786 A FR7616786 A FR 7616786A FR 7616786 A FR7616786 A FR 7616786A FR 2313161 A1 FR2313161 A1 FR 2313161A1
Authority
FR
France
Prior art keywords
realization
hard metal
shaped parts
cutting plates
metal shaped
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
Application number
FR7616786A
Other languages
English (en)
French (fr)
Other versions
FR2313161B1 (enExample
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.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
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
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Publication of FR2313161A1 publication Critical patent/FR2313161A1/fr
Application granted granted Critical
Publication of FR2313161B1 publication Critical patent/FR2313161B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/148—Composition of the cutting inserts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/38—Borides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/40—Oxides
    • C23C16/403—Oxides of aluminium, magnesium or beryllium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
    • C23C16/40—Oxides
    • C23C16/405—Oxides of refractory metals or yttrium
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/24983—Hardness
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Vapour Deposition (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Powder Metallurgy (AREA)
FR7616786A 1975-06-06 1976-06-03 Pieces faconnees en metal dur, notamment pour la realisation de plaques de coupe Granted FR2313161A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2525185A DE2525185C3 (de) 1975-06-06 1975-06-06 Hartmetallkörper

Publications (2)

Publication Number Publication Date
FR2313161A1 true FR2313161A1 (fr) 1976-12-31
FR2313161B1 FR2313161B1 (enExample) 1980-01-25

Family

ID=5948411

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7616786A Granted FR2313161A1 (fr) 1975-06-06 1976-06-03 Pieces faconnees en metal dur, notamment pour la realisation de plaques de coupe

Country Status (6)

Country Link
US (1) US4019873A (enExample)
JP (1) JPS5940907B2 (enExample)
DE (1) DE2525185C3 (enExample)
FR (1) FR2313161A1 (enExample)
GB (1) GB1499644A (enExample)
IT (1) IT1060895B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069706A1 (fr) * 1981-07-02 1983-01-12 Stellram S.A. Pièce d'usure en matériau réfractaire
WO1984001587A1 (fr) * 1982-10-10 1984-04-26 Vni Instr Revetement resistant a l'usure, en une seule couche, pour outils de coupe de metaux
EP0143889A3 (de) * 1983-09-07 1985-09-25 Fried. Krupp Gesellschaft mit beschränkter Haftung Beschichteter Hartmetallkörper

Families Citing this family (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE32093E (en) * 1971-05-26 1986-03-18 General Electric Company Aluminum oxide coated titanium-containing cemented carbide product
US4018631A (en) * 1975-06-12 1977-04-19 General Electric Company Coated cemented carbide product
DE2717842C2 (de) * 1977-04-22 1983-09-01 Fried. Krupp Gmbh, 4300 Essen Verfahren zur Oberflächenbehandlung von gesinterten Hartmetallkörpern
US4217113A (en) * 1977-06-13 1980-08-12 Massachusetts Institute Of Technology Aluminum oxide-containing metal compositions and cutting tool made therefrom
JPS5441211A (en) * 1977-09-09 1979-04-02 Sumitomo Electric Ind Ltd Covered superhard alloy parts
US4169913A (en) * 1978-03-01 1979-10-02 Sumitomo Electric Industries, Ltd. Coated tool steel and machining tool formed therefrom
CH640885A5 (de) * 1978-07-21 1984-01-31 Suisse Horlogerie Rech Lab Mit einem harten ueberzug versehene maschinenelemente.
US4652183A (en) * 1979-02-16 1987-03-24 United Technologies Corporation Amorphous boron-carbon alloy tool bits and methods of making the same
US4268582A (en) * 1979-03-02 1981-05-19 General Electric Company Boride coated cemented carbide
DE2917348C2 (de) * 1979-04-28 1984-07-12 Fried. Krupp Gmbh, 4300 Essen Verschleißfester Verbundkörper
JPS62228469A (ja) * 1980-04-30 1987-10-07 Sumitomo Electric Ind Ltd 被覆切削工具
US4619866A (en) * 1980-07-28 1986-10-28 Santrade Limited Method of making a coated cemented carbide body and resulting body
USRE34180E (en) * 1981-03-27 1993-02-16 Kennametal Inc. Preferentially binder enriched cemented carbide bodies and method of manufacture
JPS5828345B2 (ja) * 1981-04-18 1983-06-15 「船」倉 克彦 金属基材にセラミックスを接合する方法
DE3279814D1 (en) * 1981-12-16 1989-08-17 Carboloy Inc Surface-coated hard metal body and method of producing the same
US4440547A (en) * 1982-05-20 1984-04-03 Gte Laboratories Incorporated Alumina coated silicon nitride cutting tools
US4424066A (en) 1982-05-20 1984-01-03 Gte Laboratories Incorporated Alumina coated composite silicon aluminum oxynitride cutting tools
SE8205274L (sv) * 1982-09-15 1984-03-16 Santrade Ltd Sker samt metod for tillverkning av detsamma
AT385947B (de) * 1983-12-22 1988-06-10 Ver Edelstahlwerke Ag Hartmetallkoerper, insbesondere hartmetall-schneidwerkzeug
US5966585A (en) * 1984-09-18 1999-10-12 Union Carbide Coatings Service Corporation Titanium carbide/tungsten boride coatings
US4741975A (en) * 1984-11-19 1988-05-03 Avco Corporation Erosion-resistant coating system
US4761346A (en) * 1984-11-19 1988-08-02 Avco Corporation Erosion-resistant coating system
JPS61221369A (ja) * 1985-03-27 1986-10-01 Sumitomo Electric Ind Ltd 被覆超硬合金部材
DE3611001A1 (de) * 1986-04-02 1987-10-15 Agie Ag Ind Elektronik Stromzufuehrung fuer eine drahtfoermige elektrode einer elektroerosionsmaschine
US4943450A (en) * 1987-01-20 1990-07-24 Gte Laboratories Incorporated Method for depositing nitride-based composite coatings by CVD
US4745010A (en) * 1987-01-20 1988-05-17 Gte Laboratories Incorporated Process for depositing a composite ceramic coating on a cemented carbide substrate
US4751109A (en) * 1987-01-20 1988-06-14 Gte Laboratories Incorporated A process for depositing a composite ceramic coating on a hard ceramic substrate
US4749629A (en) * 1987-01-20 1988-06-07 Gte Laboratories Ultrathin laminated oxide coatings and methods
AT387988B (de) * 1987-08-31 1989-04-10 Plansee Tizit Gmbh Verfahren zur herstellung mehrlagig beschichteter hartmetallteile
US4892792A (en) * 1987-10-01 1990-01-09 Gte Laboratories Incorporated A1N coated silicon nitride based cutting tools
US4950558A (en) * 1987-10-01 1990-08-21 Gte Laboratories Incorporated Oxidation resistant high temperature thermal cycling resistant coatings on silicon-based substrates and process for the production thereof
US5088202A (en) * 1988-07-13 1992-02-18 Warner-Lambert Company Shaving razors
CA2065581C (en) 1991-04-22 2002-03-12 Andal Corp. Plasma enhancement apparatus and method for physical vapor deposition
DE4437053A1 (de) * 1994-10-18 1996-02-08 Widia Gmbh WC-Hartlegierung, Verfahren zu seiner Herstellung und seiner Verwendung
US5879823A (en) * 1995-12-12 1999-03-09 Kennametal Inc. Coated cutting tool
US5945214C1 (en) * 1996-08-28 2002-04-23 Premark Rwp Holdings Inc Diboride coated pressing surfaces for abrasion resistant laminate and making pressing surfaces
US6656329B1 (en) 1996-08-28 2003-12-02 Premark Rwp Holdings, Inc. Coated pressing surfaces for abrasion resistant laminate and making laminates therefrom
US6553667B1 (en) * 1997-09-08 2003-04-29 Trent West Apparatus and method for manufacturing composite articles including wear resistant jewelry and medical and industrial devices and components thereof
US6190514B1 (en) 1997-12-30 2001-02-20 Premark Rwp Holdings, Inc. Method for high scan sputter coating to produce coated, abrasion resistant press plates with reduced built-in thermal stress
SE522722C2 (sv) 2001-03-28 2004-03-02 Seco Tools Ab Skärverktyg belagt med titandiborid
WO2004046262A2 (en) * 2002-11-15 2004-06-03 University Of Utah Integral titanium boride coatings on titanium surfaces and associated methods
DE10354543B3 (de) * 2003-11-21 2005-08-04 H.C. Starck Gmbh Dualphasenhartstoff, Verfahren zu seiner Herstellung und dessen Verwendung
US7459105B2 (en) * 2005-05-10 2008-12-02 University Of Utah Research Foundation Nanostructured titanium monoboride monolithic material and associated methods
EP2209929B1 (de) * 2007-12-06 2013-08-21 Ceratizit Austria GmbH Beschichtetes werkzeug
US20100176339A1 (en) * 2009-01-12 2010-07-15 Chandran K S Ravi Jewelry having titanium boride compounds and methods of making the same
WO2013022503A2 (en) 2011-04-22 2013-02-14 The Regents Of The University Of California Compositional variations of tungsten tetraboride with transition metals and light elements
EP2823919B1 (en) 2012-02-27 2020-12-09 Sumitomo Electric Hardmetal Corp. Manufacturing method for a coated surface cutting tool
JP5896326B2 (ja) 2012-10-02 2016-03-30 住友電工ハードメタル株式会社 表面被覆切削工具およびその製造方法
JP5896327B2 (ja) 2012-10-02 2016-03-30 住友電工ハードメタル株式会社 表面被覆切削工具およびその製造方法
JP6213867B2 (ja) * 2013-02-21 2017-10-18 住友電工ハードメタル株式会社 表面被覆切削工具およびその製造方法
JP6738556B2 (ja) * 2015-06-26 2020-08-12 三菱マテリアル株式会社 表面被覆切削工具
EP3282036B1 (en) 2016-02-09 2023-03-29 Wilsonart LLC Method for coating stainless steel press plates

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB851208A (en) * 1958-01-17 1960-10-12 Metallgesellschaft Ag Process for the production of titanium boride coatings
FR2045776A1 (enExample) * 1969-06-02 1971-03-05 Labo Suisse Rech H Rl
DE1960836A1 (de) * 1969-12-04 1971-06-09 Erich Prof Dr Fitzer Oxydische Deckschicht
FR2170383A5 (enExample) * 1971-11-12 1973-09-14 Sandvik Ab
FR2170258A1 (enExample) * 1972-02-04 1973-09-14 Plansee Metallwerk
FR2225249A2 (en) * 1973-04-13 1974-11-08 Sandvik Ab Coating carbide cutting tools with oxides - by pretreating carbide surface to prevent binder or carbon diffusion into oxide
FR2243754A1 (enExample) * 1973-09-17 1975-04-11 Sandvik Ab
FR2282483A1 (fr) * 1974-08-07 1976-03-19 Plansee Metallwerk Objets usuels et objets de parure avec revetement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE954301C (de) * 1953-11-26 1956-12-13 Metallgesellschaft Ag Feinmaschinenlager mit gehaerteter Oberflaeche
DE1092271B (de) * 1958-01-17 1960-11-03 Metallgesellschaft Ag Verfahren zum Gasplattieren von Gegenstaenden mit Hartstoffueberzuegen
US3647576A (en) * 1967-12-26 1972-03-07 Suwa Seikosha Kk Method of hardening sintered cemented carbide compositions by boronizing
US3967035A (en) * 1973-03-12 1976-06-29 General Electric Company Coated cemented carbide product

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB851208A (en) * 1958-01-17 1960-10-12 Metallgesellschaft Ag Process for the production of titanium boride coatings
FR2045776A1 (enExample) * 1969-06-02 1971-03-05 Labo Suisse Rech H Rl
DE1960836A1 (de) * 1969-12-04 1971-06-09 Erich Prof Dr Fitzer Oxydische Deckschicht
FR2170383A5 (enExample) * 1971-11-12 1973-09-14 Sandvik Ab
FR2170258A1 (enExample) * 1972-02-04 1973-09-14 Plansee Metallwerk
FR2225249A2 (en) * 1973-04-13 1974-11-08 Sandvik Ab Coating carbide cutting tools with oxides - by pretreating carbide surface to prevent binder or carbon diffusion into oxide
FR2243754A1 (enExample) * 1973-09-17 1975-04-11 Sandvik Ab
FR2282483A1 (fr) * 1974-08-07 1976-03-19 Plansee Metallwerk Objets usuels et objets de parure avec revetement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069706A1 (fr) * 1981-07-02 1983-01-12 Stellram S.A. Pièce d'usure en matériau réfractaire
WO1984001587A1 (fr) * 1982-10-10 1984-04-26 Vni Instr Revetement resistant a l'usure, en une seule couche, pour outils de coupe de metaux
EP0143889A3 (de) * 1983-09-07 1985-09-25 Fried. Krupp Gesellschaft mit beschränkter Haftung Beschichteter Hartmetallkörper

Also Published As

Publication number Publication date
DE2525185A1 (de) 1976-12-23
DE2525185C3 (de) 1986-04-17
US4019873A (en) 1977-04-26
GB1499644A (en) 1978-02-01
JPS5940907B2 (ja) 1984-10-03
DE2525185B2 (de) 1980-02-21
JPS51148713A (en) 1976-12-21
FR2313161B1 (enExample) 1980-01-25
IT1060895B (it) 1982-09-30

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