DE3211047A1 - Vorzugsweise mit bindemittel angereicherte, zementierte carbidkoerper und verfahren zu ihrer herstellung - Google Patents

Vorzugsweise mit bindemittel angereicherte, zementierte carbidkoerper und verfahren zu ihrer herstellung

Info

Publication number
DE3211047A1
DE3211047A1 DE19823211047 DE3211047A DE3211047A1 DE 3211047 A1 DE3211047 A1 DE 3211047A1 DE 19823211047 DE19823211047 DE 19823211047 DE 3211047 A DE3211047 A DE 3211047A DE 3211047 A1 DE3211047 A1 DE 3211047A1
Authority
DE
Germany
Prior art keywords
carbide
cobalt
cemented carbide
layer
binder
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
DE19823211047
Other languages
German (de)
English (en)
Other versions
DE3211047C2 (no
Inventor
George Paul 15601 Greensburg Pa. Grab
Bela Jeno Nemeth
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.)
Kennametal Inc
Original Assignee
Kennametal Inc
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 Kennametal Inc filed Critical Kennametal Inc
Publication of DE3211047A1 publication Critical patent/DE3211047A1/de
Application granted granted Critical
Publication of DE3211047C2 publication Critical patent/DE3211047C2/de
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/04—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbonitrides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Powder Metallurgy (AREA)
  • Ceramic Products (AREA)
  • Chemical Vapour Deposition (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Compositions Of Oxide Ceramics (AREA)
DE19823211047 1981-03-27 1982-03-25 Vorzugsweise mit bindemittel angereicherte, zementierte carbidkoerper und verfahren zu ihrer herstellung Granted DE3211047A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24846581A 1981-03-27 1981-03-27

Publications (2)

Publication Number Publication Date
DE3211047A1 true DE3211047A1 (de) 1982-11-25
DE3211047C2 DE3211047C2 (no) 1988-02-11

Family

ID=22939253

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823211047 Granted DE3211047A1 (de) 1981-03-27 1982-03-25 Vorzugsweise mit bindemittel angereicherte, zementierte carbidkoerper und verfahren zu ihrer herstellung

Country Status (22)

Country Link
JP (3) JPH0674462B2 (no)
AU (1) AU539101B2 (no)
BE (1) BE892634A (no)
CA (1) CA1174438A (no)
CH (1) CH653055A5 (no)
DE (1) DE3211047A1 (no)
DK (1) DK160438C (no)
ES (2) ES510886A0 (no)
FI (1) FI74304C (no)
FR (1) FR2502613B1 (no)
GB (1) GB2095702B (no)
IE (1) IE52544B1 (no)
IL (1) IL65359A (no)
IT (1) IT1151523B (no)
LU (1) LU84034A1 (no)
MX (2) MX156716A (no)
NL (1) NL188172C (no)
NO (1) NO165628C (no)
NZ (1) NZ200007A (no)
PT (1) PT74670B (no)
SE (1) SE459100C (no)
ZA (1) ZA821717B (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744573A1 (de) * 1987-01-05 1988-07-14 Toshiba Tungaloy Co Ltd Oberflaechenraffinierter sinterlegierungskoerper und verfahren zu dessen herstellung
US6124040A (en) * 1993-11-30 2000-09-26 Widia Gmbh Composite and process for the production thereof
US6655882B2 (en) 1999-02-23 2003-12-02 Kennametal Inc. Twist drill having a sintered cemented carbide body, and like tools, and use thereof

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6047906B2 (ja) * 1981-09-25 1985-10-24 三菱マテリアル株式会社 切削用表面被覆スロ−アウエイチツプ
US4548786A (en) * 1983-04-28 1985-10-22 General Electric Company Coated carbide cutting tool insert
US4497874A (en) * 1983-04-28 1985-02-05 General Electric Company Coated carbide cutting tool insert
DE3332260A1 (de) * 1983-09-07 1985-03-28 Fried. Krupp Gmbh, 4300 Essen Beschichteter hartmetallkoerper
JPS60165340A (ja) * 1984-02-09 1985-08-28 Toshiba Tungaloy Co Ltd 選択的に部分改質した焼結合金
KR870000309B1 (ko) * 1984-05-29 1987-02-26 한국과학기술원 절삭 공구용 질화규소 소결체 및 그의 제조 방법
EP0182759B2 (en) * 1984-11-13 1993-12-15 Santrade Ltd. Cemented carbide body used preferably for rock drilling and mineral cutting
US4649084A (en) * 1985-05-06 1987-03-10 General Electric Company Process for adhering an oxide coating on a cobalt-enriched zone, and articles made from said process
JP2684721B2 (ja) * 1988-10-31 1997-12-03 三菱マテリアル株式会社 表面被覆炭化タングステン基超硬合金製切削工具およびその製造法
US5204167A (en) * 1989-02-23 1993-04-20 Toshiba Tungaloy Co., Ltd. Diamond-coated sintered body excellent in adhesion and process for preparing the same
US5181953A (en) * 1989-12-27 1993-01-26 Sumitomo Electric Industries, Ltd. Coated cemented carbides and processes for the production of same
CA2092932C (en) * 1992-04-17 1996-12-31 Katsuya Uchino Coated cemented carbide member and method of manufacturing the same
SE514181C2 (sv) * 1995-04-05 2001-01-15 Sandvik Ab Belagt hårmetallskär för fräsning av gjutjärn
US5786069A (en) 1995-09-01 1998-07-28 Sandvik Ab Coated turning insert
US6554548B1 (en) 2000-08-11 2003-04-29 Kennametal Inc. Chromium-containing cemented carbide body having a surface zone of binder enrichment
JP4703123B2 (ja) * 2004-03-23 2011-06-15 京セラ株式会社 表面被覆ＴｉＣＮ基サーメットの製造方法
JP4936742B2 (ja) * 2005-03-22 2012-05-23 京セラ株式会社 表面被覆工具および切削工具
JP4936741B2 (ja) * 2005-03-22 2012-05-23 京セラ株式会社 表面被覆工具および切削工具
DE102006018947A1 (de) * 2006-04-24 2007-10-25 Tutec Gmbh Verfahren zur Herstellung eines Hartmetallkörpers, Pulver zur Herstellung eines Hartmetalls und Hartmetallkörper
SE0700602L (sv) * 2007-03-13 2008-09-14 Sandvik Intellectual Property Hårdmetallskär och metod att tillverka detsamma
JP5590329B2 (ja) * 2011-02-03 2014-09-17 三菱マテリアル株式会社 硬質被覆層がすぐれた耐チッピング性、耐欠損性を備える表面被覆切削工具
EP2821166B1 (en) * 2013-07-04 2016-04-20 Sandvik Intellectual Property AB A method for manufacturing a wear resistant component comprising mechanically interlocked cemented carbide bodies
CN109881073B (zh) * 2019-04-26 2020-05-22 中南大学 具有粘结金属富集层表面结构的合金及其制备方法与应用
EP4275822A1 (en) * 2021-04-01 2023-11-15 Sumitomo Electric Industries, Ltd. Cemented carbide and cutting tool
EP4166261A1 (en) * 2021-10-15 2023-04-19 Sandvik Machining Solutions AB Method for manufacturing a sintered article and a sintered article
WO2023062158A1 (en) * 2021-10-15 2023-04-20 Sandvik Machining Solutions Ab A method for manufacturing a sintered article and a sintered article
CN114277299B (zh) * 2021-12-28 2022-10-04 九江金鹭硬质合金有限公司 一种抗焊接开裂的高硬度硬质合金板条

Citations (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB395134A (en) * 1931-08-28 1933-07-13 Tool Metal Mfg Company Ltd Improvements in hard alloys
DE622347C (de) * 1931-07-19 1935-11-26 Fried Krupp Akt Ges Gussstahlf Verfahren zur Herstellung von Hartmetallegierungen fuer Arbeitsgeraete und Werkzeuge aus Wolframkarbid und einem zusaetzlichen Hilfsmetall
GB439379A (en) * 1933-08-19 1935-12-05 British Thomson Houston Co Ltd Improvements in and relating to hard alloys
US2074847A (en) * 1933-08-19 1937-03-23 Gen Electric Hard alloy
DE650001C (de) * 1931-08-29 1937-09-09 Fried Krupp Akt Ges Gesinterte Hartmetallegierungen
GB478534A (en) * 1935-12-02 1938-01-20 Krupp Ag Improved sintered hard metal alloys
US2123046A (en) * 1935-12-02 1938-07-05 Gen Electric Sintered hard metal alloys
GB763409A (en) * 1953-10-21 1956-12-12 Uddeholms Ab Hard metal alloy and method for producing the same
US3564683A (en) * 1967-06-14 1971-02-23 Wolfgang Schedler Cutting of deposit forming steel and cutting tools for such steels
US3616506A (en) * 1969-01-02 1971-11-02 Sandvikens Jernverks Ab Insert for machining steel or similar material
US3736107A (en) * 1971-05-26 1973-05-29 Gen Electric Coated cemented carbide product
US3836392A (en) * 1971-07-07 1974-09-17 Sandvik Ab Process for increasing the resistance to wear of the surface of hard metal cemented carbide parts subject to wear
US3882581A (en) * 1974-03-13 1975-05-13 Minnesota Mining & Mfg Coated, partially laminated carbide cutting tool insert
US3914473A (en) * 1971-05-26 1975-10-21 Gen Electric Method of making a coated cemented carbide product
US3918138A (en) * 1973-06-20 1975-11-11 Kennametal Inc Metallurgical composition embodying hard metal carbides, and method of making
US3955038A (en) * 1973-04-09 1976-05-04 Sandvik Aktiebolag Hard metal body
US3967035A (en) * 1973-03-12 1976-06-29 General Electric Company Coated cemented carbide product
US3994692A (en) * 1974-05-29 1976-11-30 Erwin Rudy Sintered carbonitride tool materials
DE2263210B2 (de) * 1972-02-04 1977-03-17 Metallwerk Plansee AG & Co. KG, Reutte, Tirol (Österreich) Verschleissteil aus hartmetall, insbesondere fuer werkzeuge
US4035541A (en) * 1975-11-17 1977-07-12 Kennametal Inc. Sintered cemented carbide body coated with three layers
US4046517A (en) * 1975-02-14 1977-09-06 Ltd. Dijet Industrial Co Cemented carbide material for cutting operation
US4150984A (en) * 1977-09-15 1979-04-24 Ngk Spark Plug Co., Ltd. Tungsten carbide-base sintered alloys and method for production thereof
JPS5487719A (en) * 1977-12-23 1979-07-12 Sumitomo Electric Industries Super hard alloy and method of making same
GB2015536A (en) * 1978-03-03 1979-09-12 Elf Union Bitumens modified by polymers
DE2646433C3 (de) * 1975-10-14 1980-02-21 Ngk Spark Plug Co., Ltd., Nagoya, Aichi (Japan) Sinterlegierung
JPS569365A (en) * 1979-07-02 1981-01-30 Mitsubishi Metal Corp Surface coated solid carbide alloy material

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979811A (en) * 1958-10-24 1961-04-18 Nat Twist Drill & Tool Company Cemented carbide body having wettable surface and method of producing same
CA986337A (en) * 1971-05-28 1976-03-30 Brian A. Mynard Ruthenium or osmium on hard metal
US3971656A (en) * 1973-06-18 1976-07-27 Erwin Rudy Spinodal carbonitride alloys for tool and wear applications
US4049876A (en) * 1974-10-18 1977-09-20 Sumitomo Electric Industries, Ltd. Cemented carbonitride alloys
US4150195A (en) * 1976-06-18 1979-04-17 Sumitomo Electric Industries, Ltd. Surface-coated cemented carbide article and a process for the production thereof
JPS5773104A (en) * 1980-10-27 1982-05-07 Mitsubishi Metal Corp Surface-coated superhard alloy member and its production

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE622347C (de) * 1931-07-19 1935-11-26 Fried Krupp Akt Ges Gussstahlf Verfahren zur Herstellung von Hartmetallegierungen fuer Arbeitsgeraete und Werkzeuge aus Wolframkarbid und einem zusaetzlichen Hilfsmetall
GB395134A (en) * 1931-08-28 1933-07-13 Tool Metal Mfg Company Ltd Improvements in hard alloys
DE650001C (de) * 1931-08-29 1937-09-09 Fried Krupp Akt Ges Gesinterte Hartmetallegierungen
GB439379A (en) * 1933-08-19 1935-12-05 British Thomson Houston Co Ltd Improvements in and relating to hard alloys
US2074847A (en) * 1933-08-19 1937-03-23 Gen Electric Hard alloy
GB478534A (en) * 1935-12-02 1938-01-20 Krupp Ag Improved sintered hard metal alloys
US2123046A (en) * 1935-12-02 1938-07-05 Gen Electric Sintered hard metal alloys
GB763409A (en) * 1953-10-21 1956-12-12 Uddeholms Ab Hard metal alloy and method for producing the same
US3564683A (en) * 1967-06-14 1971-02-23 Wolfgang Schedler Cutting of deposit forming steel and cutting tools for such steels
US3616506A (en) * 1969-01-02 1971-11-02 Sandvikens Jernverks Ab Insert for machining steel or similar material
CH516371A (de) * 1969-01-02 1971-12-15 Sandco Ltd Schneideinsatz zur spanabhebenden Bearbeitung von Werkstoffen
US3914473A (en) * 1971-05-26 1975-10-21 Gen Electric Method of making a coated cemented carbide product
US3736107A (en) * 1971-05-26 1973-05-29 Gen Electric Coated cemented carbide product
US3836392A (en) * 1971-07-07 1974-09-17 Sandvik Ab Process for increasing the resistance to wear of the surface of hard metal cemented carbide parts subject to wear
DE2263210B2 (de) * 1972-02-04 1977-03-17 Metallwerk Plansee AG & Co. KG, Reutte, Tirol (Österreich) Verschleissteil aus hartmetall, insbesondere fuer werkzeuge
US3967035A (en) * 1973-03-12 1976-06-29 General Electric Company Coated cemented carbide product
US3955038A (en) * 1973-04-09 1976-05-04 Sandvik Aktiebolag Hard metal body
US3918138A (en) * 1973-06-20 1975-11-11 Kennametal Inc Metallurgical composition embodying hard metal carbides, and method of making
US3882581A (en) * 1974-03-13 1975-05-13 Minnesota Mining & Mfg Coated, partially laminated carbide cutting tool insert
US3994692A (en) * 1974-05-29 1976-11-30 Erwin Rudy Sintered carbonitride tool materials
US4046517A (en) * 1975-02-14 1977-09-06 Ltd. Dijet Industrial Co Cemented carbide material for cutting operation
DE2646433C3 (de) * 1975-10-14 1980-02-21 Ngk Spark Plug Co., Ltd., Nagoya, Aichi (Japan) Sinterlegierung
US4035541A (en) * 1975-11-17 1977-07-12 Kennametal Inc. Sintered cemented carbide body coated with three layers
US4150984A (en) * 1977-09-15 1979-04-24 Ngk Spark Plug Co., Ltd. Tungsten carbide-base sintered alloys and method for production thereof
JPS5487719A (en) * 1977-12-23 1979-07-12 Sumitomo Electric Industries Super hard alloy and method of making same
US4277283A (en) * 1977-12-23 1981-07-07 Sumitomo Electric Industries, Ltd. Sintered hard metal and the method for producing the same
GB2015536A (en) * 1978-03-03 1979-09-12 Elf Union Bitumens modified by polymers
JPS569365A (en) * 1979-07-02 1981-01-30 Mitsubishi Metal Corp Surface coated solid carbide alloy material

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* Cited by examiner, † Cited by third party
Title
ASTM Designation B 276-54
Fall Seminar of the Japan Society of Powder der Powder Metallurgy at Tohoku University ..., October 1980 *
J. Japan Inst. Metals, Vol. 45, Nr. 1, S. 95-99 (1981) *
KIEFFER - BENESOVSKY: Hartmetalle, 1965, S. 19, 76, 88, 89, 99-105 *
KIEFFER-BENESOVSKY: "Hartmetalle", Springer 1965, S. 188-216 *
Prospekt "Coromant Werkzeuge Ty-8523"der Fandvik- stahl GmbH *
Pulvermetallurgie und Sinterwerkstoffe, 2. Aufl., 1980, S. 41-58 (Veröffentlichung bestritten) *
Sumitomo Electric Technical Review Nr. 18, December 1978, S. 74-81 *
Sumitomo-Prospekt "New Grades" *
technica 10 (1977), S. 725-730 und VDI-Z 122 (1980), S. 155-159
Technische Mitteilungen, 64. Jahrgang, Januar/Februar 1971, S. 23-32
Transactions of the Japan Inst. of Metals, Vol. 22, Nr. 11, S. 758-764 (1981) *
VDI-Z: 1980, Nr. 13, S. 150-159 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744573A1 (de) * 1987-01-05 1988-07-14 Toshiba Tungaloy Co Ltd Oberflaechenraffinierter sinterlegierungskoerper und verfahren zu dessen herstellung
US6124040A (en) * 1993-11-30 2000-09-26 Widia Gmbh Composite and process for the production thereof
US6655882B2 (en) 1999-02-23 2003-12-02 Kennametal Inc. Twist drill having a sintered cemented carbide body, and like tools, and use thereof

Also Published As

Publication number Publication date
ES271281U (es) 1983-08-16
AU8168882A (en) 1982-11-18
NO165628B (no) 1990-12-03
NO821021L (no) 1982-09-28
LU84034A1 (fr) 1982-07-08
JPH0629475B1 (no) 1994-04-20
FR2502613A1 (fr) 1982-10-01
PT74670B (en) 1983-10-31
FI821074A0 (fi) 1982-03-26
IT1151523B (it) 1986-12-24
NL188172B (nl) 1991-11-18
NL8201161A (nl) 1982-10-18
DK160438B (da) 1991-03-11
ES8308589A1 (es) 1983-09-01
IE820537L (en) 1982-09-27
FR2502613B1 (fr) 1992-02-14
MX170393B (es) 1993-08-19
DK141182A (da) 1982-09-28
GB2095702B (en) 1986-03-19
NL188172C (nl) 1992-04-16
NZ200007A (en) 1986-09-10
IL65359A (en) 1985-07-31
IT8220395A0 (it) 1982-03-25
MX156716A (es) 1988-09-28
DE3211047C2 (no) 1988-02-11
AU539101B2 (en) 1984-09-13
PT74670A (en) 1982-04-01
JPH01201436A (ja) 1989-08-14
IE52544B1 (en) 1987-12-09
SE459100B (sv) 1989-06-05
BE892634A (fr) 1982-07-16
NO165628C (no) 1991-03-13
SE459100C (sv) 2000-01-21
JPH0674462B2 (ja) 1994-09-21
ZA821717B (en) 1983-04-27
DK160438C (da) 1991-08-19
FI821074L (fi) 1982-09-28
ES271281Y (es) 1984-03-16
IL65359A0 (en) 1982-05-31
ES510886A0 (es) 1983-09-01
CH653055A5 (fr) 1985-12-13
GB2095702A (en) 1982-10-06
CA1174438A (en) 1984-09-18
SE8201930L (sv) 1982-09-28
FI74304C (fi) 1988-01-11
JPS57194239A (en) 1982-11-29
FI74304B (fi) 1987-09-30

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