IT1093215B - Metodo di fabbricazione di un elemento di materiale plastico di supporto di informazioni di struttura stratificata e dispositivo per la concretizzazione pratica di tale metodo - Google Patents
Metodo di fabbricazione di un elemento di materiale plastico di supporto di informazioni di struttura stratificata e dispositivo per la concretizzazione pratica di tale metodoInfo
- Publication number
- IT1093215B IT1093215B IT21103/78A IT2110378A IT1093215B IT 1093215 B IT1093215 B IT 1093215B IT 21103/78 A IT21103/78 A IT 21103/78A IT 2110378 A IT2110378 A IT 2110378A IT 1093215 B IT1093215 B IT 1093215B
- Authority
- IT
- Italy
- Prior art keywords
- concretization
- practical
- manufacture
- plastic material
- structure information
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/68—Record carriers
- G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
- B29C2043/023—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves
- B29C2043/025—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves forming a microstructure, i.e. fine patterning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2833/00—Use of polymers of unsaturated acids or derivatives thereof as mould material
- B29K2833/04—Polymers of esters
- B29K2833/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
-
- 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
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/81—Sound record
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Moulding By Coating Moulds (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7702702,A NL177721B (nl) | 1977-03-14 | 1977-03-14 | Werkwijze voor het vervaardigen van een kunststofinformatiedrager met gelaagde structuur alsmede een inrichting voor het uitvoeren van de werkwijze. |
Publications (2)
Publication Number | Publication Date |
---|---|
IT7821103A0 IT7821103A0 (it) | 1978-03-10 |
IT1093215B true IT1093215B (it) | 1985-07-19 |
Family
ID=19828162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT21103/78A IT1093215B (it) | 1977-03-14 | 1978-03-10 | Metodo di fabbricazione di un elemento di materiale plastico di supporto di informazioni di struttura stratificata e dispositivo per la concretizzazione pratica di tale metodo |
Country Status (11)
Country | Link |
---|---|
US (1) | US4312823A (it) |
JP (1) | JPS53116105A (it) |
AT (1) | AT357798B (it) |
AU (1) | AU522151B2 (it) |
CA (1) | CA1106560A (it) |
DE (1) | DE2809161C3 (it) |
ES (1) | ES467783A1 (it) |
FR (1) | FR2384404A1 (it) |
GB (1) | GB1581511A (it) |
IT (1) | IT1093215B (it) |
NL (1) | NL177721B (it) |
Families Citing this family (70)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3934298A (en) * | 1974-04-23 | 1976-01-27 | Kim James S H | Toothbrush |
DE2966968D1 (en) * | 1978-08-28 | 1984-06-14 | Discovision Ass | Method for moulding a videodisc composition |
FR2450683A1 (fr) * | 1979-03-06 | 1980-10-03 | Thomson Brandt | Procede et appareil de realisation de disque video |
NL7904113A (nl) * | 1979-05-25 | 1980-11-27 | Philips Nv | Optisch uitleesbare informatieschijf, werkwijze voor de vervaardiging ervan alsmede een inrichting voor het uitvoeren van deze werkwijze. |
NL7906117A (nl) * | 1979-08-10 | 1981-02-12 | Philips Nv | Werkwijze en inrichting voor het vervaardigen van een kunststofinformatiedrager. |
FR2468456A1 (fr) * | 1979-09-06 | 1981-05-08 | Thomson Csf | Dispositif de moulage de disques porteurs d'informations |
JPS5677905A (en) * | 1979-11-28 | 1981-06-26 | Matsushita Electric Ind Co Ltd | Disk record |
JPS5687203A (en) * | 1979-12-18 | 1981-07-15 | Toppan Printing Co Ltd | Manufacture of disk |
JPS56157021U (it) * | 1980-04-22 | 1981-11-24 | ||
JPS56167422A (en) * | 1980-05-30 | 1981-12-23 | Toppan Printing Co Ltd | Manufacturing device for high-density information recording carrier |
DE3167483D1 (en) * | 1980-09-05 | 1985-01-10 | Matsushita Electric Ind Co Ltd | A method of producing an information recording disk |
US4414316A (en) * | 1980-09-05 | 1983-11-08 | Rexham Corporation | Composite lenticular screen sheet |
JPS5756314U (it) * | 1980-09-18 | 1982-04-02 | ||
US4363844A (en) * | 1980-09-22 | 1982-12-14 | Lewis Terry W | Metallized information carrying discs |
US4449916A (en) * | 1980-11-20 | 1984-05-22 | Matsushita Electric Industrial Co., Ltd. | Device for manufacturing information recording mediums |
NL8101515A (nl) * | 1981-03-27 | 1982-10-18 | Philips Nv | Optisch uitleesbare informatieschijf en werkwijze voor de vervaardiging ervan. |
JPS57163533A (en) * | 1981-04-01 | 1982-10-07 | Toppan Printing Co Ltd | Preparation of information recording carrier |
JPS57163535A (en) * | 1981-04-02 | 1982-10-07 | Toppan Printing Co Ltd | Preparation of information recording carrier |
JPS57163536A (en) * | 1981-04-02 | 1982-10-07 | Toppan Printing Co Ltd | Preparation of information recording carrier |
JPS57163534A (en) * | 1981-04-02 | 1982-10-07 | Toppan Printing Co Ltd | Preparation of information recording carrier |
US4447201A (en) * | 1981-06-29 | 1984-05-08 | Clean-Tex A/S | Vulcanizing press for vulcanizing flat articles |
FR2513934A1 (fr) * | 1981-10-06 | 1983-04-08 | Thomson Csf | Procede de demoulage de disque porteur d'informations et dispositif mettant en oeuvre un tel procede |
JPS5862021A (ja) * | 1981-10-08 | 1983-04-13 | Toppan Printing Co Ltd | 高密度情報記録担体の製造方法 |
FR2514689B1 (fr) * | 1981-10-21 | 1986-05-23 | Souriau & Cie | Procede d'obtention avec precision d'une piece presentant des parties en creux et/ou en saillie et produit obtenu par ce procede |
FR2516286A1 (fr) * | 1981-11-06 | 1983-05-13 | Thomson Csf | Procede d'obtention d'un disque-copie a partir d'une gravure originale portee par une matrice |
JPS5882726A (ja) * | 1981-11-12 | 1983-05-18 | Toppan Printing Co Ltd | 高密度情報担体の製造方法 |
JPS5884730A (ja) * | 1981-11-13 | 1983-05-20 | Sanyo Electric Co Ltd | デイスクレコ−ド製造方法 |
NL8300417A (nl) * | 1983-02-04 | 1984-09-03 | Philips Nv | Werkwijze en inrichting voor het vervaardigen van een kunststofinformatiedrager met een gelaagde structuur. |
JPS6066344A (ja) * | 1983-09-21 | 1985-04-16 | Toshiba Corp | 光ディスク |
IT1175178B (it) * | 1983-11-15 | 1987-07-01 | Omv Spa Off Mecc Veronese | Estrattore di oggetti ottenuti con termoformatrici |
JPS60122138A (ja) * | 1983-12-06 | 1985-06-29 | Pioneer Electronic Corp | 情報記録円板の製造装置 |
JPS60224532A (ja) * | 1984-04-23 | 1985-11-08 | Matsushita Electric Ind Co Ltd | 情報記録担体の製造方法 |
EP0168530B1 (en) * | 1984-07-05 | 1990-04-04 | Docdata N.V. | Method and apparatus for reproducing relief structures onto a substrate |
JPH0740378B2 (ja) * | 1984-12-07 | 1995-05-01 | 株式会社日立製作所 | 情報記録担体複製方法及びその装置 |
US4724023A (en) * | 1985-04-09 | 1988-02-09 | E M Partners Ag | Method of making laminated glass |
NL8501148A (nl) * | 1985-04-19 | 1986-11-17 | Optical Storage Int | Werkwijze voor het aanbrengen van een optisch detecteerbare structuur op het substraat van een optisch uitleesbare informatieschijf, matrijs ten behoeve van de werkwijze, inrichting voor het uitvoeren van de werkwijze, alsmede informatieschijf vervaardigd volgens de werkwijze. |
JPS6392438A (ja) * | 1986-10-07 | 1988-04-22 | Pioneer Electronic Corp | 情報記録デイスクの転写層成形装置 |
JPS6378313U (it) * | 1986-11-11 | 1988-05-24 | ||
JPS6378314U (it) * | 1986-11-11 | 1988-05-24 | ||
JPS63109856U (it) * | 1986-12-26 | 1988-07-15 | ||
DE3719200A1 (de) * | 1987-06-09 | 1988-12-29 | Ibm Deutschland | Optische speicherplatte und verfahren zu ihrer herstellung |
DE3826234A1 (de) * | 1988-08-02 | 1990-02-08 | Kulzer & Co Gmbh | Schaltungsanordnung zum betrieb einer niederdruckgasentladungslampe |
JP2570402B2 (ja) * | 1988-09-30 | 1997-01-08 | 日本ビクター株式会社 | 光学式情報記録媒体成型装置 |
NL9002517A (nl) * | 1990-11-19 | 1992-06-16 | Philips Nv | Werkwijze voor het vervaardigen van een optisch uitleesbare plaat, alsmede inrichting voor de uitvoering van de werkwijze. |
NL9100366A (nl) * | 1991-02-28 | 1992-09-16 | Philips & Du Pont Optical | Werkwijze voor het vervaardigen van een schijfvormige informatiedrager, informatiedrager vervaardigd volgens de werkwijze en inrichting voor het uitvoeren van de werkwijze. |
US5938810A (en) * | 1996-10-23 | 1999-08-17 | Donnelly Corporation | Apparatus for tempering and bending glass |
US5857358A (en) * | 1996-10-23 | 1999-01-12 | Donnelly Corporation | Method and apparatus for bending glass |
JP4184091B2 (ja) * | 2001-05-22 | 2008-11-19 | 日立マクセル株式会社 | 射出成形方法 |
ITTO20010823A1 (it) * | 2001-08-22 | 2003-02-22 | Taltos S P A | Processo per la realizzazione di un pannello composito pietra-vetro epannello ottenuto con tale processo. |
TW531742B (en) * | 2001-10-30 | 2003-05-11 | Ritek Corp | Manufacturing method for disk cover layer |
US20080160129A1 (en) | 2006-05-11 | 2008-07-03 | Molecular Imprints, Inc. | Template Having a Varying Thickness to Facilitate Expelling a Gas Positioned Between a Substrate and the Template |
US7179079B2 (en) * | 2002-07-08 | 2007-02-20 | Molecular Imprints, Inc. | Conforming template for patterning liquids disposed on substrates |
US7019819B2 (en) * | 2002-11-13 | 2006-03-28 | Molecular Imprints, Inc. | Chucking system for modulating shapes of substrates |
US7641840B2 (en) * | 2002-11-13 | 2010-01-05 | Molecular Imprints, Inc. | Method for expelling gas positioned between a substrate and a mold |
US7790231B2 (en) * | 2003-07-10 | 2010-09-07 | Brewer Science Inc. | Automated process and apparatus for planarization of topographical surfaces |
EP1538482B1 (en) * | 2003-12-05 | 2016-02-17 | Obducat AB | Device and method for large area lithography |
JP4393244B2 (ja) * | 2004-03-29 | 2010-01-06 | キヤノン株式会社 | インプリント装置 |
EP1594001B1 (en) | 2004-05-07 | 2015-12-30 | Obducat AB | Device and method for imprint lithography |
DE102004028501B3 (de) * | 2004-06-11 | 2006-05-04 | Maschinenfabrik Lauffer Gmbh & Co Kg | Presse, insbesondere Laminierpresse |
US7798801B2 (en) * | 2005-01-31 | 2010-09-21 | Molecular Imprints, Inc. | Chucking system for nano-manufacturing |
JP4820099B2 (ja) | 2005-03-01 | 2011-11-24 | 株式会社リコー | フレキシブル転写体及びフレキシブル光ディスクの製造方法 |
US8215946B2 (en) | 2006-05-18 | 2012-07-10 | Molecular Imprints, Inc. | Imprint lithography system and method |
US7830498B2 (en) * | 2006-10-10 | 2010-11-09 | Hewlett-Packard Development Company, L.P. | Hydraulic-facilitated contact lithography apparatus, system and method |
WO2009041373A1 (ja) * | 2007-09-28 | 2009-04-02 | Toray Industries, Inc. | 微細形状転写シートの製造方法及び製造装置 |
JP5411557B2 (ja) * | 2009-04-03 | 2014-02-12 | 株式会社日立ハイテクノロジーズ | 微細構造転写装置 |
US8913230B2 (en) * | 2009-07-02 | 2014-12-16 | Canon Nanotechnologies, Inc. | Chucking system with recessed support feature |
FR2965974B1 (fr) * | 2010-10-12 | 2013-11-29 | Soitec Silicon On Insulator | Procédé de collage moléculaire de substrats en silicium et en verre |
NL2016593B1 (en) * | 2016-04-12 | 2017-11-01 | Iai Ind Systems B V | Method and apparatus for applying a layer having a relief on a flat face of a substrate. |
CN107322854B (zh) * | 2017-07-13 | 2020-01-03 | 上海航天控制技术研究所 | 一种磁码盘霍尔器件及其制备方法和灌胶模具 |
DE112019005871B4 (de) * | 2018-11-26 | 2023-10-12 | Edge Embossing, Inc. | Thermoplastische Formanordnung |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1209308A (en) * | 1913-03-27 | 1916-12-19 | Edmond Lanhoffer | Apparatus for molding objects by pressure. |
US1260002A (en) * | 1913-03-28 | 1918-03-19 | Edmond Lanhoffer | Apparatus for molding objects by pressure. |
US2441097A (en) * | 1946-06-15 | 1948-05-04 | Owens Corning Fiberglass Corp | Plastics molding apparatus |
US2565949A (en) * | 1947-04-12 | 1951-08-28 | Walter B Clifford | Process and apparatus for molding sheet material |
US2991600A (en) * | 1957-08-26 | 1961-07-11 | Talbot A Lancaster | Method and apparatus for vacuum packaging with plastic sheaths |
NL239956A (it) * | 1958-06-13 | |||
US2962757A (en) * | 1958-12-18 | 1960-12-06 | Gen Tire & Rubber Co | Method of and apparatus for molding and vulcanizing a fabric reinforced rubber air spring bellows |
US2968064A (en) * | 1959-06-24 | 1961-01-17 | Gen Motors Corp | Clamping frame for vacuum forming parts |
US3112570A (en) * | 1960-06-06 | 1963-12-03 | Vasconcellos Decio Fernande De | Optical set |
FR1507289A (fr) * | 1966-11-16 | 1967-12-29 | Pathe Marconi Ind Music | Procédé et dispositif pour la fabrication de disques phonographiques par injection |
BE754422A (nl) * | 1969-08-13 | 1971-02-05 | Shell Int Research | Methode en apparaat voor het vormen van voorwerpen uit een vel |
US3594877A (en) * | 1969-10-24 | 1971-07-27 | Yuken Kogyo Co Ltd | Apparatus for manufacturing ceramic articles |
BE793335A (fr) * | 1971-12-27 | 1973-04-16 | Teldec Telefunken Decca | Dispositif pour le marquage de porteurs d'information se composant d'une feuille de matiere synthetique. |
NL7212045A (it) * | 1972-09-05 | 1974-03-07 | ||
NL164688C (nl) * | 1973-10-15 | 1981-01-15 | Mca Disco Vision | Werkwijze voor de vervaardiging van een videoschijf waarbij uitgaande van een moedermatrijs eerst een vorm wordt vervaardigd. |
-
1977
- 1977-03-14 NL NLAANVRAGE7702702,A patent/NL177721B/xx not_active IP Right Cessation
-
1978
- 1978-03-03 DE DE2809161A patent/DE2809161C3/de not_active Expired
- 1978-03-09 CA CA298,551A patent/CA1106560A/en not_active Expired
- 1978-03-10 GB GB9551/78A patent/GB1581511A/en not_active Expired
- 1978-03-10 AU AU34071/78A patent/AU522151B2/en not_active Expired
- 1978-03-10 IT IT21103/78A patent/IT1093215B/it active
- 1978-03-11 ES ES467783A patent/ES467783A1/es not_active Expired
- 1978-03-11 JP JP2819078A patent/JPS53116105A/ja active Granted
- 1978-03-13 AT AT177878A patent/AT357798B/de not_active IP Right Cessation
- 1978-03-14 FR FR7807293A patent/FR2384404A1/fr active Granted
-
1980
- 1980-02-26 US US06/124,878 patent/US4312823A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS53116105A (en) | 1978-10-11 |
ATA177878A (de) | 1979-12-15 |
DE2809161A1 (de) | 1978-09-21 |
NL7702702A (nl) | 1978-09-18 |
AU3407178A (en) | 1979-09-13 |
FR2384404A1 (fr) | 1978-10-13 |
NL177721B (nl) | 1985-06-03 |
ES467783A1 (es) | 1978-10-16 |
DE2809161B2 (it) | 1980-07-10 |
IT7821103A0 (it) | 1978-03-10 |
AU522151B2 (en) | 1982-05-20 |
DE2809161C3 (de) | 1985-11-21 |
FR2384404B1 (it) | 1984-05-18 |
CA1106560A (en) | 1981-08-11 |
GB1581511A (en) | 1980-12-17 |
AT357798B (de) | 1980-07-25 |
JPS618762B2 (it) | 1986-03-17 |
US4312823A (en) | 1982-01-26 |
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