IT1143185B - IMPROVEMENT IN ANALOGUE ELECTRONIC SWITCHES AND TRANSDUCERS SENSITIVE TO PRESSURE, IN PARTICULAR FOR ELECTRONIC MUSICAL INSTRUMENTS - Google Patents

IMPROVEMENT IN ANALOGUE ELECTRONIC SWITCHES AND TRANSDUCERS SENSITIVE TO PRESSURE, IN PARTICULAR FOR ELECTRONIC MUSICAL INSTRUMENTS

Info

Publication number
IT1143185B
IT1143185B IT50239/80A IT5023980A IT1143185B IT 1143185 B IT1143185 B IT 1143185B IT 50239/80 A IT50239/80 A IT 50239/80A IT 5023980 A IT5023980 A IT 5023980A IT 1143185 B IT1143185 B IT 1143185B
Authority
IT
Italy
Prior art keywords
improvement
pressure
musical instruments
electronic
analogue
Prior art date
Application number
IT50239/80A
Other languages
Italian (it)
Other versions
IT8050239A0 (en
Inventor
Franklin Neal Eventoff
Serge A Tcherepnin
Tyrone M Christiansen
Original Assignee
Franklin Neal Eventoff
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
Priority claimed from US06/097,610 external-priority patent/US4268815A/en
Priority claimed from US06/110,416 external-priority patent/US4276538A/en
Priority claimed from US06/135,386 external-priority patent/US4301337A/en
Priority claimed from US06/140,921 external-priority patent/US4315238A/en
Priority claimed from US06/140,937 external-priority patent/US4314228A/en
Application filed by Franklin Neal Eventoff filed Critical Franklin Neal Eventoff
Publication of IT8050239A0 publication Critical patent/IT8050239A0/en
Application granted granted Critical
Publication of IT1143185B publication Critical patent/IT1143185B/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
    • H01H13/807—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/029—Composite material comprising conducting material dispersed in an elastic support or binding material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
    • H01H13/785—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
    • H01H13/80—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the manner of cooperation of the contacts, e.g. with both contacts movable or with bounceless contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/703—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by spacers between contact carrying layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/002—Contacts bounceless
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/032—Conductive polymer; Rubber
    • H01H2201/036—Variable resistance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/012—Microprotrusions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/02—Interspersed fingers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2211/00—Spacers
    • H01H2211/026—Spacers without separate element
    • H01H2211/032—Pressure sensitive layer on contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/002—Venting with external pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/016—Venting in adhesive layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H01H2215/008—Part of substrate or membrane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/008—Actuators other then push button
    • H01H2221/02—Actuators other then push button pneumatic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2225/00—Switch site location
    • H01H2225/002—Switch site location superimposed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2225/00—Switch site location
    • H01H2225/006—Switch site location more then one pole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/012—Conductive rubber
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/012—Conductive rubber
    • H01H2227/014—Conductive particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/002—Screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/012—Vacuum deposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/014—Electro deposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/028—Adhesive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/038—Folding of flexible printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/018—Musical instrument
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/016—Miscellaneous combined with start switch, discrete keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/078—Variable resistance by variable contact area or point
    • 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
    • Y10S84/00—Music
    • Y10S84/07—Electric key switch structure
IT50239/80A 1979-11-26 1980-11-25 IMPROVEMENT IN ANALOGUE ELECTRONIC SWITCHES AND TRANSDUCERS SENSITIVE TO PRESSURE, IN PARTICULAR FOR ELECTRONIC MUSICAL INSTRUMENTS IT1143185B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US06/097,610 US4268815A (en) 1979-11-26 1979-11-26 Multi-function touch switch apparatus
US06/110,416 US4276538A (en) 1980-01-07 1980-01-07 Touch switch keyboard apparatus
US06/135,386 US4301337A (en) 1980-03-31 1980-03-31 Dual lateral switch device
US06/140,921 US4315238A (en) 1979-09-24 1980-04-16 Bounceless switch apparatus
US06/140,937 US4314228A (en) 1980-04-16 1980-04-16 Pressure transducer

Publications (2)

Publication Number Publication Date
IT8050239A0 IT8050239A0 (en) 1980-11-25
IT1143185B true IT1143185B (en) 1986-10-22

Family

ID=27536842

Family Applications (1)

Application Number Title Priority Date Filing Date
IT50239/80A IT1143185B (en) 1979-11-26 1980-11-25 IMPROVEMENT IN ANALOGUE ELECTRONIC SWITCHES AND TRANSDUCERS SENSITIVE TO PRESSURE, IN PARTICULAR FOR ELECTRONIC MUSICAL INSTRUMENTS

Country Status (8)

Country Link
AU (1) AU544234B2 (en)
CA (1) CA1153801A (en)
DE (1) DE3044384C2 (en)
FR (1) FR2470435B1 (en)
GB (4) GB2064873B (en)
IT (1) IT1143185B (en)
NL (1) NL8006409A (en)
SE (1) SE452925B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8674932B2 (en) 1996-07-05 2014-03-18 Anascape, Ltd. Image controller
US9081426B2 (en) 1992-03-05 2015-07-14 Anascape, Ltd. Image controller

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US4566363A (en) * 1983-03-02 1986-01-28 Casio Computer Co., Ltd. Electronic musical instrument
US4680432A (en) * 1984-08-07 1987-07-14 Casio Computer Co., Ltd. Compact electronic device
US4554033A (en) * 1984-10-04 1985-11-19 Amp Incorporated Method of forming an electrical interconnection means
DE3446327A1 (en) * 1984-12-19 1986-06-26 Telefunken Electronic Gmbh Resistance element with foam plastic
US4617608A (en) * 1984-12-28 1986-10-14 At&T Bell Laboratories Variable gap device and method of manufacture
JPS61239299A (en) * 1985-04-16 1986-10-24 ヤマハ株式会社 Electronic percussion instrument
US4965421A (en) * 1985-09-26 1990-10-23 John Fluke Mfg. Co., Inc. Particulate spacers for touch sensitive overlay panel applications
CN1010143B (en) * 1985-09-26 1990-10-24 约翰弗兰克制造公司 Particulate spacers for touch sensitive overlay panel applications
US4794366A (en) * 1985-11-15 1988-12-27 Toshiba Silicone Co., Ltd. Key-touch sensor and method of manufacture
DE3624166A1 (en) * 1986-07-17 1988-01-21 Schoeller & Co Elektrotech FILM SWITCHING
GB2225660A (en) * 1988-12-05 1990-06-06 Autoliv Dev A trigger circuit arrangement for a vehicle safety device, eg a crash bag
EP0489344A1 (en) * 1990-12-03 1992-06-10 I.E.E. International Electronics & Engineering S.à.r.l. Method for identifying an activated key of a keyboard
FR2692419B1 (en) * 1992-01-24 1997-05-16 Fusilier Jean Marie APPLICATION OF A FLAT KEYBOARD WITH PROGRESSIVE BUTTONS TO THE WIRELESS REMOTE CONTROL OF A FUNCTIONAL UNIT.
DE4216349C2 (en) * 1992-05-17 1994-06-09 Reinhold Fahrion Electronic musical instrument with a melody and an accompaniment keyboard
DE4237072C1 (en) * 1992-11-03 1993-12-02 Daimler Benz Ag Resistive film pressure or force sensor for indicating occupation of vehicle seat - has conductive paths for providing series of meandering interdigitated local area transducer electrodes on polymer and semiconductor substrate.
DE4332927C2 (en) * 1993-09-28 1995-06-29 Schurter Gmbh Piezo switching element
WO1995022828A1 (en) * 1994-02-17 1995-08-24 Interlink Electronics, Inc. Layered pressure sensitive transducer and method for making same
DE19530092A1 (en) * 1995-08-16 1997-02-20 Daimler Benz Ag Checkable film pressure sensor
JPH10155593A (en) * 1996-11-28 1998-06-16 Aisin Seiki Co Ltd Pressure-sensitive switch
JP3962959B2 (en) * 1996-12-20 2007-08-22 アイシン精機株式会社 Pressure sensitive switch
DE19748485A1 (en) * 1997-11-03 1999-05-06 Todor Dimitriev Musical instrument key
DE10247404B4 (en) * 2002-10-04 2007-10-18 T & T Medilogic Medizintechnik Gmbh Sensor for detecting forces by size and direction and pressure measuring plate formed therefrom
CN101069075B (en) 2004-12-08 2012-05-30 Abb专利有限公司 Method for producing a measuring transducer
US7468199B2 (en) 2004-12-23 2008-12-23 3M Innovative Properties Company Adhesive membrane for force switches and sensors
US7260999B2 (en) 2004-12-23 2007-08-28 3M Innovative Properties Company Force sensing membrane
US7509881B2 (en) 2005-07-29 2009-03-31 3M Innovative Properties Company Interdigital force switches and sensors
EP2006869A1 (en) * 2007-06-22 2008-12-24 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Film-type switching element

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GB608669A (en) * 1945-12-19 1948-09-20 Speed Marketing Company Sussex Improvements in fluid pressure operated switches
US3122617A (en) * 1960-10-07 1964-02-25 Kollsman Instr Corp Pressure control switch
GB969167A (en) * 1962-03-26 1964-09-09 Karl Torsten Kalle A device for transmitting impulses
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US3806471A (en) * 1968-04-29 1974-04-23 R Mitchell Pressure responsive resistive material
US3551616A (en) * 1969-01-15 1970-12-29 Ibm Multiple switch encoding device
US3503031A (en) * 1969-02-11 1970-03-24 Control Data Corp Printed circuit keyboard
US3626350A (en) * 1969-02-20 1971-12-07 Nippon Musical Instruments Mfg Variable resistor device for electronic musical instruments capable of playing monophonic, chord and portamento performances with resilient contact strips
BE756130A (en) * 1969-09-15 1971-03-15 Essex International Inc PRESSURE SENSITIVE SWITCH-CUTTER COMBINATION
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US3617666A (en) * 1970-04-30 1971-11-02 Data Appliance Corp Pressure-operated layered electrical switch and switch array
US3758733A (en) * 1971-10-04 1973-09-11 Essex International Inc Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome
US3979568A (en) * 1974-09-23 1976-09-07 Xerox Corporation Keyboard switch assembly having raised contacts supported by helicline legs on a common conductive sheet
US4085302A (en) * 1976-11-22 1978-04-18 Control Data Corporation Membrane-type touch panel
FR2443129A1 (en) * 1978-11-29 1980-06-27 Serras Paulet Edouard ELECTRICAL OR ELECTRONIC SWITCHING DEVICE FORMING PUSH BUTTON OR KEYBOARD WITH SOCKET KEYS
FR2443130A1 (en) * 1978-11-29 1980-06-27 Serras Paulet Edouard CONTROL KEYBOARD FOR ELECTRIC OR ELECTRONIC DEVICES
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9081426B2 (en) 1992-03-05 2015-07-14 Anascape, Ltd. Image controller
US8674932B2 (en) 1996-07-05 2014-03-18 Anascape, Ltd. Image controller

Also Published As

Publication number Publication date
GB2134320A (en) 1984-08-08
GB8318533D0 (en) 1983-08-10
GB2064873A (en) 1981-06-17
GB2134322B (en) 1985-05-01
GB2064873B (en) 1984-09-05
AU544234B2 (en) 1985-05-23
GB8318534D0 (en) 1983-08-10
FR2470435B1 (en) 1985-06-14
DE3044384A1 (en) 1981-08-27
IT8050239A0 (en) 1980-11-25
CA1153801A (en) 1983-09-13
AU6467980A (en) 1981-06-04
SE8008205L (en) 1981-05-27
GB2134322A (en) 1984-08-08
GB2134321A (en) 1984-08-08
DE3044384C2 (en) 1994-05-11
SE452925B (en) 1987-12-21
NL8006409A (en) 1981-06-16
GB8322859D0 (en) 1983-09-28
GB2134320B (en) 1985-05-01
GB2134321B (en) 1985-05-01
FR2470435A1 (en) 1981-05-29

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