FR2437667A1 - Support d'enregistrement magnetique - Google Patents
Support d'enregistrement magnetiqueInfo
- Publication number
- FR2437667A1 FR2437667A1 FR7827700A FR7827700A FR2437667A1 FR 2437667 A1 FR2437667 A1 FR 2437667A1 FR 7827700 A FR7827700 A FR 7827700A FR 7827700 A FR7827700 A FR 7827700A FR 2437667 A1 FR2437667 A1 FR 2437667A1
- Authority
- FR
- France
- Prior art keywords
- layer
- magnetic recording
- support
- recording medium
- chrome
- 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
- 229910000684 Cobalt-chrome Inorganic materials 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
- G11B5/676—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
A.SUPPORT D'ENREGISTREMENT MAGNETIQUE. B.SUPPORT CARACTERISE EN CE QU'IL SE COMPOSE D'UNE PREMIERE COUCHE FORMANT UNE SURFACE DE SUPPORT DESTINEE A ETRE TOURNEE VERS LA TETE D'ENREGISTREMENT ET QUI EST FORMEE D'UN ALLIAGE CHROME-COBALT CONTENANT ENTRE ENVIRON 5 ET 25 EN POIDS DE CHROME, AVEC UN AXE D'AIMANTATION FACILE ESSENTIELLEMENT PERPENDICULAIRE A LA SURFACE, L'EPAISSEUR DE CETTE PREMIERE COUCHE NE DEPASSANT PAS 3,0MICRONS, AINSI QUE D'UNE SECONDE COUCHE FORMEE D'UNE MATIERE A FAIBLE FORCE COERCITIVE PLACEE SUR LE COTE DE LA PREMIERE COUCHE QUI N'EST PAS TOURNEE VERS LA TETE D'ENREGISTREMENT, ET QUI A UNE FORCE COERCITIVE QUI NE DEPASSE PAS 15 DE LA FORCE COERCITIVE DE LA PREMIERE COUCHE, L'EPAISSEUR DE LA SECONDE COUCHE ETANT AU MOINS EGALES A 0,1MICRON.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52118424A JPS5891B2 (ja) | 1977-09-30 | 1977-09-30 | 磁気記録媒体 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2437667A1 true FR2437667A1 (fr) | 1980-04-25 |
FR2437667B1 FR2437667B1 (fr) | 1985-04-19 |
Family
ID=14736290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7827700A Granted FR2437667A1 (fr) | 1977-09-30 | 1978-09-27 | Support d'enregistrement magnetique |
Country Status (7)
Country | Link |
---|---|
US (1) | US4210946A (fr) |
JP (1) | JPS5891B2 (fr) |
CA (1) | CA1112359A (fr) |
DE (1) | DE2842609A1 (fr) |
FR (1) | FR2437667A1 (fr) |
GB (1) | GB2006508B (fr) |
NL (1) | NL187506C (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2474737A1 (fr) * | 1980-01-30 | 1981-07-31 | Anelva Corp | Milieu d'enregistrement magnetique comprenant du nickel, du cobalt et du chrome de facon a obtenir une anisotropie magnetique perpendiculaire |
Families Citing this family (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2827870A1 (de) * | 1978-06-24 | 1980-01-10 | Ibm Deutschland | Magnetischer aufzeichnungstraeger mit vertikaler aufzeichnung |
JPS5827859Y2 (ja) * | 1979-03-01 | 1983-06-17 | 日産自動車株式会社 | 給電トロリの防塵機構 |
JPS55153142A (en) * | 1979-05-15 | 1980-11-28 | Olympus Optical Co Ltd | Magnetic recording and reproducing device |
JPS5644109A (en) * | 1979-09-17 | 1981-04-23 | Toshiba Corp | Magnetic recording and reproducing system |
US4383284A (en) * | 1979-12-14 | 1983-05-10 | Tokyo Shibaura Denki Kabushiki Kaisha | Perpendicular magnetic head and method of manufacturing the same |
JPS56127929A (en) * | 1980-03-07 | 1981-10-07 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS5782227A (en) * | 1980-11-11 | 1982-05-22 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS56127930A (en) * | 1980-03-10 | 1981-10-07 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
US4429016A (en) * | 1980-03-07 | 1984-01-31 | Matsushita Electric Industrial Co., Ltd. | Magnetic recording medium with vacuum deposited magnetic layer |
US4367257A (en) * | 1980-04-16 | 1983-01-04 | Fuji Photo Film Co., Ltd. | Thin magnetic recording medium |
JPS56148729A (en) * | 1980-04-21 | 1981-11-18 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS5715204A (en) * | 1980-06-30 | 1982-01-26 | Sharp Corp | Photomagnetic recording and reproducing device |
JPS5734324A (en) * | 1980-08-08 | 1982-02-24 | Teijin Ltd | Manufacture of vertically magnetized film |
JPS5745208A (en) * | 1980-09-01 | 1982-03-15 | Tdk Corp | Magnetic recording medium |
JPS5758226A (en) * | 1980-09-22 | 1982-04-07 | Toshiba Corp | Magnetic recording medium |
JPS5769541A (en) * | 1980-10-17 | 1982-04-28 | Olympus Optical Co Ltd | Recording medium and recording and reproducing system using sand medium |
JPS57109127A (en) * | 1980-12-05 | 1982-07-07 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS57100627A (en) * | 1980-12-12 | 1982-06-22 | Teijin Ltd | Manufacture of vertical magnetic recording medium |
EP0070907A4 (fr) * | 1981-02-08 | 1983-06-08 | Akio Ohtsubo | Tete magnetique a un seul pole du type a enregistrement vertical. |
JPS57170505A (en) * | 1981-04-13 | 1982-10-20 | Nippon Gakki Seizo Kk | Tape for magnetic recording |
JPS57195327A (en) * | 1981-05-26 | 1982-12-01 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS5819474A (ja) * | 1981-07-27 | 1983-02-04 | Victor Co Of Japan Ltd | 機能性メツキ膜の製法 |
US4745509A (en) * | 1981-08-21 | 1988-05-17 | Matsushita Electric Industrial Company, Limited | Magnetic head with improved supporter for perpendicular magnetization recording |
JPS5834903A (ja) * | 1981-08-27 | 1983-03-01 | Tdk Corp | 磁気記録媒体 |
US4388367A (en) * | 1981-09-28 | 1983-06-14 | Xerox Corporation | Perpendicular magnetic recording medium and fabrication |
JPS5862823A (ja) * | 1981-10-08 | 1983-04-14 | Nec Corp | 垂直磁気記憶体 |
JPS5864634A (ja) * | 1981-10-13 | 1983-04-18 | Hitachi Maxell Ltd | 磁気記録媒体 |
JPS5867006A (ja) * | 1981-10-19 | 1983-04-21 | Yoshifumi Sakurai | 積層垂直磁化膜 |
JPS5896706A (ja) * | 1981-12-04 | 1983-06-08 | Tdk Corp | 磁気記録媒体 |
US4675224A (en) * | 1981-12-26 | 1987-06-23 | Seiko Epson Kabushiki Kaisha | Magnetic recording medium |
JPS58130440A (ja) * | 1982-01-29 | 1983-08-03 | Seiko Epson Corp | 磁気デイスク |
JPS58141433A (ja) * | 1982-02-16 | 1983-08-22 | Teijin Ltd | 磁気記録媒体とその製造方法 |
US4520413A (en) * | 1982-04-13 | 1985-05-28 | Minnesota Mining And Manufacturing Company | Integrated magnetostrictive-piezoelectric-metal oxide semiconductor magnetic playback head |
US4404247A (en) * | 1982-07-02 | 1983-09-13 | Minnesota Mining And Manufacturing Company | Protective covering for magnetic recording medium |
US4621030A (en) * | 1982-07-19 | 1986-11-04 | Hitachi, Ltd. | Perpendicular magnetic recording medium and manufacturing method thereof |
US4541026A (en) * | 1982-07-20 | 1985-09-10 | Vertimag Systems Corporation | Hybrid read-write head for perpendicular recording media |
JPH07105027B2 (ja) * | 1982-10-01 | 1995-11-13 | 株式会社日立製作所 | 垂直磁気記録媒体 |
US4472248A (en) * | 1982-12-20 | 1984-09-18 | Minnesota Mining And Manufacturing Company | Method of making thin-film magnetic recording medium having perpendicular anisotropy |
JPS59142737A (ja) * | 1983-02-02 | 1984-08-16 | Nec Corp | 磁気2重層垂直磁気記憶体 |
DE3465647D1 (en) * | 1983-03-08 | 1987-10-01 | Ulvac Corp | A magnetic recording member and a manufacturing method for such a member |
JPS59172142A (ja) * | 1983-03-20 | 1984-09-28 | Hitachi Maxell Ltd | 磁気記録媒体 |
JPH0670858B2 (ja) * | 1983-05-25 | 1994-09-07 | ソニー株式会社 | 光磁気記録媒体とその製法 |
JPS6021508A (ja) * | 1983-07-16 | 1985-02-02 | Alps Electric Co Ltd | 磁気記録媒体 |
US4671999A (en) * | 1983-09-19 | 1987-06-09 | Minnesota Mining And Manufacturing Company | Magnetic recording media having perfluoropolyether coating |
JPS6063710A (ja) * | 1983-09-19 | 1985-04-12 | Hitachi Ltd | 磁気ディスク媒体 |
US4705699A (en) * | 1983-09-19 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Method of coating magnetic recording media with perfluoropolyether compositions which are soluble in non-fluorinated solvents |
US4526833A (en) * | 1983-10-03 | 1985-07-02 | Minnesota Mining And Manufacturing Company | Magnetic recording medium having a perfluoropolyether polymer protective coating |
JPS60101710A (ja) * | 1983-11-05 | 1985-06-05 | Alps Electric Co Ltd | 垂直磁気記録媒体 |
JPS60101709A (ja) * | 1983-11-05 | 1985-06-05 | Alps Electric Co Ltd | 垂直磁気記録媒体 |
US4700253A (en) * | 1983-11-22 | 1987-10-13 | Minnesota Mining And Manufacturing Company | Slanted pole head for magnetic recording |
JPS60143431A (ja) * | 1983-12-29 | 1985-07-29 | Alps Electric Co Ltd | 垂直磁気記録媒体 |
US5013583A (en) * | 1984-02-11 | 1991-05-07 | Teijin Limited | Method of producing a magnetic recording medium |
JPS60193126A (ja) * | 1984-03-13 | 1985-10-01 | Anelva Corp | 垂直磁化フレキシブルデイスク |
JPS61129737A (ja) * | 1984-11-26 | 1986-06-17 | Tdk Corp | 磁気記録媒体の製造方法 |
US4729924A (en) * | 1984-12-21 | 1988-03-08 | Minnesota Mining And Manufacturing Company | Metallic thin film magnetic recording medium having a hard protective layer |
US4803130A (en) * | 1984-12-21 | 1989-02-07 | Minnesota Mining And Manufacturing Company | Reactive sputtering process for recording media |
US4717592A (en) * | 1984-12-24 | 1988-01-05 | Fuji Photo Film Co., Ltd. | Vertical magnetization type recording medium and manufacturing method therefor |
EP0190854A3 (fr) * | 1985-01-28 | 1988-07-20 | Toray Industries, Inc. | Méthode de fabrication d'un milieu d'enregistrement magnétique perpendiculaire |
US4731300A (en) * | 1985-03-07 | 1988-03-15 | Victor Company Of Japan, Ltd. | Perpendicular magnetic recording medium and manufacturing method thereof |
JPH0640361B2 (ja) * | 1985-03-07 | 1994-05-25 | 日本ビクター株式会社 | 垂直磁気記録再生方法 |
DE3672639D1 (de) * | 1985-03-26 | 1990-08-23 | Matsushita Electric Ind Co Ltd | Aufzeichnungstraeger mit senkrechter magnetisierung. |
DE3610431A1 (de) * | 1985-03-28 | 1986-10-02 | Victor Company Of Japan, Ltd., Yokohama, Kanagawa | Quermagnetisierungsaufzeichnungsmedium |
US4798765A (en) * | 1985-03-28 | 1989-01-17 | Victor Company Of Japan Ltd. | Perpendicular magnetic recording medium |
JPH0727663B2 (ja) * | 1985-04-03 | 1995-03-29 | ヤマハ株式会社 | 光磁気記録媒体およびその製法 |
US4803577A (en) * | 1985-06-12 | 1989-02-07 | Tdk Corporation | Vertical magnetic recording system using rigid disk |
CA1254385A (fr) * | 1985-07-26 | 1989-05-23 | Noboru Sato | Support d'enregistrement magneto-optique fait d'un stratifie artificiel amorphe comprenant un element de terre rare et un element de metal de transition |
JPS62177721A (ja) * | 1986-01-31 | 1987-08-04 | Nec Corp | 磁気記録体 |
JP2522246B2 (ja) * | 1986-05-06 | 1996-08-07 | ブラザー工業株式会社 | 薄膜磁気記録媒体の製造方法 |
US4966821A (en) * | 1986-07-17 | 1990-10-30 | Ricoh Company, Ltd. | Perpendicular magnetic recording medium |
JPS6339124A (ja) * | 1986-08-01 | 1988-02-19 | Hitachi Maxell Ltd | 磁気記録媒体及びその製造方法 |
US5153044A (en) * | 1987-02-25 | 1992-10-06 | Komag, Inc. | Magnetic disk for longitudinal recording comprising an amorphous intermediate layer |
JP2524514B2 (ja) * | 1987-09-21 | 1996-08-14 | 日立マクセル株式会社 | 磁気記録媒体 |
JP2673807B2 (ja) * | 1987-10-30 | 1997-11-05 | パイオニア株式会社 | 光磁気記録媒体の製造方法 |
US4897749A (en) * | 1988-03-16 | 1990-01-30 | Magnetic Peripherals Inc. | Combination probe and ring head for vertical recording |
DE3831484A1 (de) * | 1988-09-16 | 1990-03-29 | Basf Ag | Verfahren zur herstellung von magnetischen aufzeichnungstraegern fuer die vertikalaufzeichnung |
WO1991000593A1 (fr) * | 1989-06-28 | 1991-01-10 | Siemens Aktiengesellschaft | Dispositif a memoire magnetique avec support d'enregistrement et tete magnetique a couche mince |
US5379172A (en) * | 1990-09-19 | 1995-01-03 | Seagate Technology, Inc. | Laminated leg for thin film magnetic transducer |
DE4442682C2 (de) * | 1994-11-30 | 1997-12-18 | Bogen Electronic Gmbh | Kodierkopf zum Magnetisieren von Schichten |
TW349224B (en) * | 1997-05-15 | 1999-01-01 | Nat Science Council | Aluminum alloy electroplated with Co-Cr magnetic recording film thereon and process for producing the same |
US6455174B1 (en) * | 1998-11-05 | 2002-09-24 | Hitachi Maxell, Ltd. | Magnetic recording medium, recording and reproducing head, and magnetic recording and reproducing method |
US6955857B2 (en) | 2000-12-29 | 2005-10-18 | Seagate Technology Llc | Exchange decoupled cobalt/noble metal perpendicular recording media |
US7449255B2 (en) * | 2002-09-30 | 2008-11-11 | Seagate Technology Llc | High moment directionally textured soft magnetic underlayer in a magnetic storage medium |
JP4023408B2 (ja) | 2003-02-04 | 2007-12-19 | 富士電機デバイステクノロジー株式会社 | 垂直磁気記録媒体用基板、垂直磁気記録媒体及びそれらの製造方法 |
US6936353B1 (en) * | 2003-07-02 | 2005-08-30 | Seagate Technology Llc | Tilted recording medium design with (101-2) orientation |
JP4539282B2 (ja) | 2004-04-16 | 2010-09-08 | 富士電機デバイステクノロジー株式会社 | 垂直磁気記録媒体用ディスク基板及びそれを用いた垂直磁気記録媒体 |
JP4479528B2 (ja) | 2004-07-27 | 2010-06-09 | 富士電機デバイステクノロジー株式会社 | ガラス基体へのめっき方法、そのめっき方法を用いる磁気記録媒体用ディスク基板の製造方法及び垂直磁気記録媒体の製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB671269A (en) * | 1949-11-02 | 1952-04-30 | Brush Dev Co | Improvements in or relating to multi-layer magnetic record members |
GB976102A (en) * | 1961-02-13 | 1964-11-25 | Sperry Rand Corp | Method to produce multiple layer magnetic elements |
US3219353A (en) * | 1962-11-30 | 1965-11-23 | Ibm | Magnetic recording medium |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3185775A (en) * | 1958-03-10 | 1965-05-25 | Iit Res Inst | Oriented tape |
US3052567A (en) * | 1959-09-23 | 1962-09-04 | Minnesota Mining & Mfg | Magnetic recording medium |
NL265011A (fr) * | 1960-05-19 | 1900-01-01 | ||
BE640044A (fr) * | 1962-11-30 | 1964-03-16 | ||
GB1427731A (en) * | 1972-03-18 | 1976-03-10 | Emi Ltd | Magnetic recording media and to methods for their production |
GB1427724A (en) * | 1972-03-28 | 1976-03-10 | Emi Ltd | Magnetic recording media |
GB1458353A (fr) * | 1973-01-17 | 1976-12-15 | ||
GB1457258A (en) * | 1973-01-25 | 1976-12-01 | Emi Ltd | Magnetic recording media |
DE2512456A1 (de) * | 1975-03-21 | 1976-10-07 | Basf Ag | Magnetischer datentraeger |
JPS5843815B2 (ja) * | 1975-10-23 | 1983-09-29 | 富士写真フイルム株式会社 | ジキキロクテ−プ |
US4024489A (en) * | 1975-11-18 | 1977-05-17 | International Business Machines Corporation | Magnetoresistive sandwich including sensor electrically parallel with electrical shunt and magnetic biasing layers |
JPS5278403A (en) * | 1975-12-25 | 1977-07-01 | Teac Corp | Magnetic recording media |
US4075672A (en) * | 1976-02-09 | 1978-02-21 | Graham Magnetics Incorporated | Magnetic recording members |
US4079169A (en) * | 1976-11-15 | 1978-03-14 | International Business Machines Corporation | Cobalt base alloy as protective layer for magnetic recording media |
JPS5434205A (en) * | 1977-08-22 | 1979-03-13 | Canon Inc | Magnetic recording medium |
-
1977
- 1977-09-30 JP JP52118424A patent/JPS5891B2/ja not_active Expired
-
1978
- 1978-09-19 US US05/943,749 patent/US4210946A/en not_active Expired - Lifetime
- 1978-09-27 FR FR7827700A patent/FR2437667A1/fr active Granted
- 1978-09-28 CA CA312,249A patent/CA1112359A/fr not_active Expired
- 1978-09-29 DE DE19782842609 patent/DE2842609A1/de active Granted
- 1978-09-29 GB GB7838711A patent/GB2006508B/en not_active Expired
- 1978-10-02 NL NLAANVRAGE7809950,A patent/NL187506C/xx not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB671269A (en) * | 1949-11-02 | 1952-04-30 | Brush Dev Co | Improvements in or relating to multi-layer magnetic record members |
GB976102A (en) * | 1961-02-13 | 1964-11-25 | Sperry Rand Corp | Method to produce multiple layer magnetic elements |
US3219353A (en) * | 1962-11-30 | 1965-11-23 | Ibm | Magnetic recording medium |
Non-Patent Citations (1)
Title |
---|
EXBK/78 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2474737A1 (fr) * | 1980-01-30 | 1981-07-31 | Anelva Corp | Milieu d'enregistrement magnetique comprenant du nickel, du cobalt et du chrome de facon a obtenir une anisotropie magnetique perpendiculaire |
Also Published As
Publication number | Publication date |
---|---|
US4210946A (en) | 1980-07-01 |
DE2842609C2 (fr) | 1987-11-19 |
GB2006508A (en) | 1979-05-02 |
JPS5451804A (en) | 1979-04-24 |
NL7809950A (nl) | 1979-04-03 |
JPS5891B2 (ja) | 1983-01-05 |
FR2437667B1 (fr) | 1985-04-19 |
CA1112359A (fr) | 1981-11-10 |
NL187506C (nl) | 1991-10-16 |
DE2842609A1 (de) | 1979-04-12 |
GB2006508B (en) | 1982-01-27 |
NL187506B (nl) | 1991-05-16 |
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