ES467167A1 - Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante - Google Patents
Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislanteInfo
- Publication number
- ES467167A1 ES467167A1 ES467167A ES467167A ES467167A1 ES 467167 A1 ES467167 A1 ES 467167A1 ES 467167 A ES467167 A ES 467167A ES 467167 A ES467167 A ES 467167A ES 467167 A1 ES467167 A1 ES 467167A1
- Authority
- ES
- Spain
- Prior art keywords
- control
- line
- diameter
- capacitance
- values
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D5/00—Control of dimensions of material
- G05D5/02—Control of dimensions of material of thickness, e.g. of rolled material
- G05D5/03—Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric means
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/146—Controlling the extrusion apparatus dependent on the capacitance or the thickness of the insulating material
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92085—Velocity
- B29C2948/92095—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92085—Velocity
- B29C2948/92104—Flow or feed rate
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92123—Diameter or circumference
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92619—Diameter or circumference
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92733—Electrical properties
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92933—Conveying, transporting or storage of articles
-
- 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
- Y10S118/00—Coating apparatus
- Y10S118/18—Wire and cord die
-
- 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
- Y10S118/00—Coating apparatus
- Y10S118/22—Wire and cord miscellaneous
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
- Molding Of Porous Articles (AREA)
Abstract
Perfeccionamientos en aparatos para recubrir hilo conductor con plástico aislante, del tipo que comprenden; medios para hacer que el hilo conductor avance en un trayecto; un cabezal recubridor situado en el trayecto; un dispositivo de extrusión de plástico fundido para proporcionar plástico fundido al cabezal de extrusión; habiendose diseñado el cabezal para producir la aplicación de una capa del plástico fundido en el hilo conductor al pasar por el cabezal; medios para enfriar el hilo conductor recubierto con plástico al salir del cabezal; medios para controlar el régimen de extrusión del plástico por el dispositivo de extrusión del plástico, caracterizados porque se disponen medios para obtener una medida analógica del régimen de extrusión; medios para convertir la medida del régimen de extrusión en un valor digital representativo de la misma; medios para comparar el régimen del valor digital de extrusión con un valor digital almacenado representativo de régimen de extrusión deseado; y como consecuencia de la comparación se genera una señal digital correctiva para alterar la velocidad con el fin de reducir la diferencia entre el valor almacenado y el valor medio del régimen de extrusión; y medios para convertir la señal digital en correctiva en una señal analógica para alimentación a los medios que controlan el régimen de extrusión.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA264,575A CA1087712A (en) | 1976-11-01 | 1976-11-01 | Control for wire coating line |
Publications (1)
Publication Number | Publication Date |
---|---|
ES467167A1 true ES467167A1 (es) | 1979-10-16 |
Family
ID=4107168
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES463724A Expired ES463724A1 (es) | 1976-11-01 | 1977-10-31 | Perfeccionamientos en aparatos para revestir cable con ais- lamiento plastico. |
ES467167A Expired ES467167A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante |
ES467165A Expired ES467165A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir un hilo conduc-tor con plastico aislante |
ES467168A Expired ES467168A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante |
ES467166A Expired ES467166A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES463724A Expired ES463724A1 (es) | 1976-11-01 | 1977-10-31 | Perfeccionamientos en aparatos para revestir cable con ais- lamiento plastico. |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES467165A Expired ES467165A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir un hilo conduc-tor con plastico aislante |
ES467168A Expired ES467168A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante |
ES467166A Expired ES467166A1 (es) | 1976-11-01 | 1978-02-21 | Perfeccionamientos en aparatos para recubrir hilo conductor con plastico aislante |
Country Status (10)
Country | Link |
---|---|
US (1) | US4068615A (es) |
JP (1) | JPS5373381A (es) |
CA (1) | CA1087712A (es) |
CH (1) | CH623164A5 (es) |
DE (1) | DE2748819A1 (es) |
ES (5) | ES463724A1 (es) |
FR (1) | FR2369079A1 (es) |
GB (1) | GB1591534A (es) |
NL (1) | NL7711133A (es) |
SE (1) | SE7711698L (es) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4174236A (en) * | 1977-08-31 | 1979-11-13 | Western Electric Company, Inc. | Methods of and apparatus for controlling capacitance unbalance-to-ground in cables |
US4585603A (en) * | 1982-03-15 | 1986-04-29 | Showa Electric Wire & Cable Co., Ltd | Method for controlling an extrusion line for foamed insulation cables involving use of a plurality of generated and measured electrical signals |
US4470941A (en) * | 1982-06-02 | 1984-09-11 | Bioresearch Inc. | Preparation of composite surgical sutures |
GB2130763B (en) * | 1982-11-15 | 1986-05-21 | Beta Instr Co | Method and apparatus for controlling a cellular foam cable coating extrusion process |
US4592881A (en) * | 1982-11-15 | 1986-06-03 | Beta Instrument Company Limited | Method for controlling a foam resin cable coating extrusion process |
GB2138178A (en) * | 1983-04-13 | 1984-10-17 | Ford Motor Co | Controlling an adhesive laying machine |
FR2554019B1 (fr) * | 1983-10-28 | 1986-12-05 | Thomson Jeumont Cables | Systeme d'extrusion de matieres en couches a epaisseurs constantes et reglables |
GB8505199D0 (en) * | 1985-02-28 | 1985-04-03 | Bicc Plc | Extrusion control |
GB8729436D0 (en) * | 1987-12-17 | 1988-02-03 | Univ Strathclyde | Process control system |
US5501734A (en) * | 1992-02-06 | 1996-03-26 | Gillette Canada, Inc. | Yarn coating assembly and applicator |
DE4305081C2 (de) * | 1993-02-19 | 1996-08-01 | Minnesota Mining & Mfg | Verfahren und Vorrichtung zum Auftragen von Haftkleber auf Bogen aus Papier oder dergleichen Material |
US5885722A (en) * | 1994-02-15 | 1999-03-23 | Minnesota Mining And Manufacturing | Method for applying coating materials to overlapped individuals sheets |
US5863330A (en) * | 1994-08-17 | 1999-01-26 | Minnesota Mining And Manufacturing Company | Apparatus and method for applying coating materials to individual sheet meters |
US5654031A (en) * | 1994-09-06 | 1997-08-05 | Minnesota Mining And Manufacturing Company | Web coating apparatus |
DE10205005A1 (de) * | 2002-02-07 | 2003-08-21 | Neumag Gmbh & Co Kg | Verfahren und Vorrichtung zum Benetzen eines laufenden Filamentbündels |
US7329113B2 (en) * | 2004-03-19 | 2008-02-12 | Leseman Steven R | Adjustable extrusion die |
DE102006058754B4 (de) * | 2006-12-04 | 2015-07-16 | Sikora Aktiengesellschaft | Verfahren zum Betrieb einer Produktionsanlage zur Herstellung eines Kabels |
US8074596B2 (en) * | 2007-04-30 | 2011-12-13 | Corning Cable Systems Llc | Apparatus for forming a sheath over an elongate member, extruder system and method of manufacturing a fiber optic cable |
JP5242209B2 (ja) * | 2008-03-24 | 2013-07-24 | 古河電気工業株式会社 | 光ファイバの製造方法 |
US20100024722A1 (en) * | 2008-07-31 | 2010-02-04 | Harold Ochs | Apparatus for Coating Dental Tape |
US20100028527A1 (en) * | 2008-07-31 | 2010-02-04 | Harold Ochs | Process for Coating Dental Tape |
US20100024721A1 (en) * | 2008-07-31 | 2010-02-04 | Harold Ochs | Apparatus for Coating Dental Tape |
US8316865B2 (en) | 2008-07-31 | 2012-11-27 | Mcneil-Ppc, Inc. | Process for winding dental tape |
US8236376B2 (en) * | 2008-09-02 | 2012-08-07 | Pascale Industries, Inc. | Production of nanoparticle-coated yarns |
CN102982919A (zh) * | 2012-11-26 | 2013-03-20 | 晶锋集团股份有限公司 | 一种可自动调节线缆护套厚薄的线缆生产线 |
US9592528B2 (en) | 2015-04-22 | 2017-03-14 | Delphi Technologies, Inc. | Extruding machine |
CN110614189A (zh) * | 2018-06-20 | 2019-12-27 | 南京中远高分子材料科技有限公司 | 一种隔音棉涂胶方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2369858A (en) * | 1943-03-26 | 1945-02-20 | Standard Telephones Cables Ltd | Cable forming apparatus |
DE1040098B (de) * | 1953-09-03 | 1958-10-02 | Western Electric Co | Vorrichtung zur fortlaufenden Ermittlung der Kapazitaet von aufeinanderfolgenden vorbestimmten Laengen eines langgestreckten, mit einem plastischen Isoliermaterial umpressten Leiters zwecks Steuerung der Strangpressung |
US3295163A (en) * | 1964-04-28 | 1967-01-03 | Western Electric Co | Strand cooling apparatus |
US3256562A (en) * | 1964-08-10 | 1966-06-21 | Western Electric Co | Extruding system |
CH462910A (de) * | 1967-02-13 | 1968-09-30 | Gen Cable Corp | Verfahren und Vorrichtung zum Aufbringen von Kunststoffschichten auf einen elektrischen Leiter |
US3502752A (en) * | 1967-02-13 | 1970-03-24 | Gen Cable Corp | Control of the dimensions of multiple layers of extruded insulation |
US3564661A (en) * | 1967-11-06 | 1971-02-23 | Uniroyal Inc | Flexible mandrels |
US3899384A (en) * | 1970-12-02 | 1975-08-12 | William F Kelly | Apparatus for manufacturing a tendon |
US3689747A (en) * | 1970-12-09 | 1972-09-05 | Ibm | Digital evaporation monitor system |
US3746575A (en) * | 1971-07-21 | 1973-07-17 | Anaconda Wire & Cable Co | Method of detecting holidays during dual extrusions |
US3986477A (en) * | 1974-03-11 | 1976-10-19 | The General Engineering Co. (Radcliffe) Ltd. | Wire coating apparatus |
-
1976
- 1976-11-01 CA CA264,575A patent/CA1087712A/en not_active Expired
- 1976-11-10 US US05/740,354 patent/US4068615A/en not_active Expired - Lifetime
-
1977
- 1977-09-28 GB GB40349/77A patent/GB1591534A/en not_active Expired
- 1977-10-11 NL NL7711133A patent/NL7711133A/xx not_active Application Discontinuation
- 1977-10-17 SE SE7711698A patent/SE7711698L/xx unknown
- 1977-10-27 JP JP12824477A patent/JPS5373381A/ja active Granted
- 1977-10-27 CH CH1310577A patent/CH623164A5/it not_active IP Right Cessation
- 1977-10-28 FR FR7732796A patent/FR2369079A1/fr active Granted
- 1977-10-31 DE DE19772748819 patent/DE2748819A1/de not_active Ceased
- 1977-10-31 ES ES463724A patent/ES463724A1/es not_active Expired
-
1978
- 1978-02-21 ES ES467167A patent/ES467167A1/es not_active Expired
- 1978-02-21 ES ES467165A patent/ES467165A1/es not_active Expired
- 1978-02-21 ES ES467168A patent/ES467168A1/es not_active Expired
- 1978-02-21 ES ES467166A patent/ES467166A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA1087712A (en) | 1980-10-14 |
NL7711133A (nl) | 1978-05-03 |
SE7711698L (sv) | 1978-05-02 |
CH623164A5 (es) | 1981-05-15 |
ES467168A1 (es) | 1979-10-16 |
ES467165A1 (es) | 1979-10-16 |
JPS6111411B2 (es) | 1986-04-02 |
JPS5373381A (en) | 1978-06-29 |
ES467166A1 (es) | 1979-10-16 |
FR2369079B1 (es) | 1982-06-18 |
ES463724A1 (es) | 1978-06-01 |
GB1591534A (en) | 1981-06-24 |
DE2748819A1 (de) | 1978-05-03 |
US4068615A (en) | 1978-01-17 |
FR2369079A1 (fr) | 1978-05-26 |
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