US3643201A - Impedance matching microstrip connector - Google Patents

Impedance matching microstrip connector Download PDF

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Publication number
US3643201A
US3643201A US9710A US3643201DA US3643201A US 3643201 A US3643201 A US 3643201A US 9710 A US9710 A US 9710A US 3643201D A US3643201D A US 3643201DA US 3643201 A US3643201 A US 3643201A
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US
United States
Prior art keywords
pins
signal
receptacles
circuit board
receptacle
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 - Lifetime
Application number
US9710A
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English (en)
Inventor
Robert George Harwood
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.)
TE Connectivity Corp
Original Assignee
AMP 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 AMP Inc filed Critical AMP Inc
Application granted granted Critical
Publication of US3643201A publication Critical patent/US3643201A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/73—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures connecting to other rigid printed circuits or like structures
    • H01R12/735—Printed circuits including an angle between each other
    • H01R12/737—Printed circuits being substantially perpendicular to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6581—Shield structure
    • H01R13/6585—Shielding material individually surrounding or interposed between mutually spaced contacts

Definitions

  • ABSTRACT Disclosed is a connector for making matched impedance connections. for example. as between two microstrip circuit boards.
  • One-half of the connector has pins located therein with one end of each pin electrically connected to respective signal and ground planes in one microstrip.
  • the second hall of the connector has receptacles located therein.
  • each receptacle mating, or making electrical contact respectively with, signal and ground planes on the second microstrip circuit board.
  • the pins and receptacles are arranged in a pattern such that matched impedance, as between the two connectors, and therefore the two microstrip circuit boards, is effected.
  • a connector comprising two housing members, one containing receptacles therein, and one containing pins to be received by said receptacles.
  • a matchingpin and receptacle is electrically connected to signal circuitry on the respective microstrip circuit board to which the connector housing member is attached.
  • respective pins and receptacles are carried by each housing member, which are attached to ground circuitry on the respective microstrip circuit boards attached to each'connector housing member.
  • Each signal pin or receptacle is generally centrally located with respect to a plurality of ground pins or receptacles.
  • the number of ground pins and receptacles can be either increased or decreased, spaced farther away from or closer to, its respective signal pin or receptacle. In this manner, matched impedance, as between the two connectors and their relative microstrip circuit boards, is attained.
  • FIG. I is a perspective view of the preferred embodiment of the invention showing the connector just prior to being assembled with each half carrying a microstrip circuit board in mother-daughter board relationship.
  • FIG. 2 is a section view showing a connector housing member containing the receptacles and their method of attaching to the microstrip circuit board.
  • FIG. 3 shows a different embodiment wherein the half of the connector containing the receptacles is used in conjunction with an adapter to thereby allow interconnection as between the connector housing half and a coaxial cable.
  • FIG. 4 shows an embodiment where adjacent signal contacts share one ground contact.
  • FIG. 5 is yet another embodiment where adjacent signal contacts share two ground contacts.
  • FIG. 6 is yet a further embodiment showing each signal contact being surrounded by six ground contacts and adjacent signal contacts sharing two ground contacts.
  • FIG. 1 there is seen a separated connector generally indicated at 10.
  • the male housing member is indicated as at 12, and the female housing member is indicated as at 14.
  • Male housing member 12 contains therein a plurality of pins 16, the rear ends of these pins 16 are connected, such as by soldering, to appropriate circuitry on the microstrip circuit board 18.
  • the entire backface of circuit board 18 is coated with electrically conductive material such as copper, the edge of which can be seen at 20.
  • Located on the front face of circuit board 18 are two signal circuits 22, 22, which are electrically connected to signal pins 24, 24. All of the pins other than pins 24, 24 have their ends connected to the copper coating 20, which constitutes a ground circuit plane.
  • receptacle members 26 located therein is a plurality of receptacle members 26. These receptacle members are electrically connected to various circuitry located on microswitch circuit board 28. Located on the upper face of microswitch circuit board 28 is a full coating of copper or other electrically conductive material 30. Located on the bottom face of microstrip circuit board 28 are two signal circuits 32, 32. Two of the receptacles 34, 34 are connected electrically at their one end to signal circuits 32, 32. The remainder of the receptacles 26 are electrically connected at their ends to the copper coating 30, which constitutes a ground circuit plane.
  • each signal pin and signal receptacle is surrounded by a plurality of ground pins and ground receptacles, the particular pattern allowing for a given matched impedance as between the two microswitch circuit boards.
  • FIG. 2 shown in cross section is a typical female housing member 36 containing a signal receptacle 38 and a plurality of ground receptacles 40.
  • the signal receptacle 38 has means connecting it to the signal plane or circuit 42, and the ground receptacles 40 are electrically connected to the ground plane 44 of the microstrip 46.
  • microstrip circuit boards could be sandwiched, thereby allowing high density use of the invention.
  • strip-line wherein two signal circuits are sandwiched between two ground planes.
  • the inventive concept of the instant connector is easily adaptable to strip-line.
  • FIG. 3 there is seen a different embodiment of the invention wherein a typical female housing member of the instant invention is used in conjunction with an adapter thereby allowing hookup of a coaxial cable thereto.
  • the female housing member 43 has ground receptacles 50, a signal receptacle 52 located therein, which receptacles are electrically connected to appropriate circuitry on a microstrip circuit board, which is not shown.
  • the adapter 54 has located therein, ground pins 56 and a signal pin 58. This adapter matingly receives a coaxial cable 60, the signal pin of which comes into electrical contact with signal pin 58 of adapter 54, and the ground plane or shield of the coaxial cable comes into contact with the various ground pins 56.
  • the connector of the instant invention will allow connection of coaxial cables to a microminiaturized environment.
  • the contact arrangement shown in FIG. 4 provides for adjacent signal contacts to share or have a mutual ground contact. In this manner, more compact spacing can be achieved and a sacrifice in crosstalk can be acceptable.
  • FIGS. 5 and 6 there is seen two more embodiments showing the arrangement of shared ground contacts by adjacent signal contacts.
  • FIGS. 5 and 6 there is seen two more embodiments showing the arrangement of shared ground contacts by adjacent signal contacts.
  • these arrangements provide for greater compactness at the expense of higher levels of crosstalk.
  • An electrical connection for making matched impedance connection between a microstrip circuit board and a coaxial cable conductor comprising a first housing member connected to said microstrip circuit board and having a plurality of receptacles therein, at least one of said receptacles constituting a signal receptacle and having one end electrically connected to signal circuitry located on one face of said microstrip circuit board, the remaining receptacles being located around said signal receptacle and constituting ground receptacles each having one end electrically connected to ground plane circuitry located on the opposite face of said microstrip circuit board, a second housing member having the end of a coaxial cable connected thereto, said second housing member having.
  • a plurality of pins extending outwardly therefrom, only one of said pins constituting a signal pin and having one end thereof electrically connected to the signal conductor in said coaxial cable, the remaining pins being located around said signal pin and constituting ground pins each having one end, electrically connected to the ground plane or shield of the coaxial cable, whereby said receptacles will receive said pins allowing for a matched impedance electrical connection.
  • each microstrip circuit board having electrically conductive ground plane circuitry located on one side thereof and at least one electrically conductive signal circuit located on the opposite side thereof, said first circuit board having one pin and said second circuit board having one receptacle in electrical engagement with respective signal circuitry thereon, said first circuit board having a plurality of pins in electrical engagement with said ground plane circuitry thereon and in surrounding relationship to said one pin, and said second circuit board having a plurality of receptacles in electrical engagement with said ground plane circuitry thereon and in surrounding relationship to said one receptacle, first and second dielectric housing members in respective engagement with said first and second circuit boards and respectively housing said pins and receptacles, the radial spacing of said pin and receptacle relative to said surrounding plurality of pins and receptacles, and the number of said plurality of pins and receptacles being predetermined so as to achieve a matched impedance connection between said
  • each circuit board and respective connector includes a plurality of signal circuits including respectively, signal pins and receptacles, each respective signal pin and signal receptacle being surrounded by a plurality, respectively, of ground plane pins and sockets, the number of ground plane pins and sockets being determined by the level of crosstalk desired between adjacent signal circuits.
  • each signal pin and receptacle of two adjacent circuits share some of the respective surrounding ground plane pins and sockets at the expense of higher crosstalk.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US9710A 1970-02-09 1970-02-09 Impedance matching microstrip connector Expired - Lifetime US3643201A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US971070A 1970-02-09 1970-02-09

Publications (1)

Publication Number Publication Date
US3643201A true US3643201A (en) 1972-02-15

Family

ID=21739280

Family Applications (1)

Application Number Title Priority Date Filing Date
US9710A Expired - Lifetime US3643201A (en) 1970-02-09 1970-02-09 Impedance matching microstrip connector

Country Status (10)

Country Link
US (1) US3643201A (de)
JP (1) JPS5331273B1 (de)
AT (1) AT308879B (de)
BE (1) BE762669A (de)
DE (1) DE2104057A1 (de)
ES (1) ES387879A1 (de)
FR (1) FR2078323A5 (de)
GB (1) GB1280794A (de)
NL (1) NL151574B (de)
SE (1) SE360543B (de)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865452A (en) * 1973-08-01 1975-02-11 Ind Electronic Hardware Corp Spark gap protection in cathode ray tube sockets
US3889129A (en) * 1972-09-22 1975-06-10 Siemens Ag Direct-current supply connector
DE2949013A1 (de) * 1979-12-06 1981-06-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Uebergang von einem koaxialkabel auf einen mehrpoligen steckverbinder
US4308891A (en) * 1980-03-31 1982-01-05 Double A Products Co. Terminal blocks and indicator for solenoid valves
US4398783A (en) * 1981-06-22 1983-08-16 International Telephone & Telegraph Corporation Coaxial cable connector
WO1984002631A1 (en) * 1982-12-29 1984-07-05 Western Electric Co Semiconductor chip package
US4494308A (en) * 1981-07-25 1985-01-22 Kabelmetal Electro Gmbh Connecting a cable to a P.C. board
US4552420A (en) * 1983-12-02 1985-11-12 E. I. Du Pont De Nemours And Company Electrical connector using a flexible circuit having an impedance control arrangement thereon
US4600256A (en) * 1984-12-31 1986-07-15 Motorola, Inc. Condensed profile electrical connector
US4610495A (en) * 1985-03-07 1986-09-09 Rogers Corporation Solderless connector apparatus and method of making the same
US4664458A (en) * 1985-09-19 1987-05-12 C W Industries Printed circuit board connector
EP0243021A1 (de) * 1986-04-21 1987-10-28 Micro Component Technology, Inc. Impedanzanpassungsmittel
US4747787A (en) * 1987-03-09 1988-05-31 Amp Incorporated Ribbon cable connector
US4755147A (en) * 1986-05-20 1988-07-05 Control Data Corporation Flex head connector with ground plane
US4762500A (en) * 1986-12-04 1988-08-09 Amp Incorporated Impedance matched electrical connector
EP0288081A3 (de) * 1987-04-23 1989-03-15 W.L. Gore & Associates GmbH Verbinderabschirmung für elektrische Verbinder
US4839587A (en) * 1988-03-29 1989-06-13 Digital Equipment Corporation Test fixture for tab circuits and devices
EP0291620A3 (de) * 1986-05-19 1989-11-29 United Technologies Corporation Lötfreie, eindrückbare Steckverbinder für Hochfrequenz- und Gleichstromverbindungen
EP0418045A1 (de) * 1989-09-12 1991-03-20 Nec Corporation Koaxialer Stiftsteckverbinder mit einer Gruppierung von leitenden zylindrischen Hülsen
US5040998A (en) * 1989-04-20 1991-08-20 Japan Aviation Electronics Industry Limited Plug connector for microstrip line
US5118300A (en) * 1991-05-23 1992-06-02 Amp Incorporated Active electrical connector
US5882227A (en) * 1997-09-17 1999-03-16 Intercon Systems, Inc. Controlled impedance connector block
WO1999056352A3 (en) * 1998-04-29 2000-02-03 Litton Systems Inc High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US6267625B1 (en) 1999-04-21 2001-07-31 Litton Systems, Inc. High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US6447339B1 (en) * 2001-12-12 2002-09-10 Tektronix, Inc. Adapter for a multi-channel signal probe
US20090268749A1 (en) * 2000-03-06 2009-10-29 Juniper Networks, Inc. Enhanced cmts for reliability, availability, and serviceability
EP2175526A1 (de) * 2008-10-13 2010-04-14 Tyco Electronics Corporation Verbinderanordnung mit Signal- und Koaxialkontakten
US20120077381A1 (en) * 2010-09-23 2012-03-29 Tyco Electronics Corporation Press fit cable connector
US20130040499A1 (en) * 2011-08-10 2013-02-14 Hon Hai Precision Industry Co., Ltd. Electrical connector with different contacts sharing a same soldering leg
US20150255927A1 (en) * 2012-09-28 2015-09-10 Molex Incorporated Electric connector

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130021B (en) * 1982-11-12 1986-03-12 Teradyne Inc Electrically connecting printed circuit boards
JPS60110952U (ja) * 1983-12-28 1985-07-27 カルソニックカンセイ株式会社 多段切換えサ−モスイツチ
DE3511344A1 (de) * 1985-03-28 1986-10-02 Siemens AG, 1000 Berlin und 8000 München Steckverbinder fuer rueckwandverdrahtungen
GB2189652B (en) * 1986-03-26 1990-01-24 Plessey Co Plc Adaptor for connecting a coaxial transmission line to a parallel plate transmission medium
DE4001762C1 (de) * 1990-01-23 1991-06-13 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
US5189638A (en) * 1990-04-26 1993-02-23 Mitsubishi Denki Kabushiki Kaisha Portable semiconductor memory device
DE4036081C2 (de) * 1990-04-26 1994-10-06 Mitsubishi Electric Corp Halbleiterspeicher-Steckmodul
US6139364A (en) * 1995-09-08 2000-10-31 Motorola, Inc. Apparatus for coupling RF signals
AU2003229239A1 (en) * 2002-07-05 2004-01-23 Huber+Suhner Ag Microwave connector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179912A (en) * 1963-02-08 1965-04-20 Amp Inc Coaxial connector for printed circuit board
US3509513A (en) * 1968-03-27 1970-04-28 Ibm Cables connecting assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179912A (en) * 1963-02-08 1965-04-20 Amp Inc Coaxial connector for printed circuit board
US3509513A (en) * 1968-03-27 1970-04-28 Ibm Cables connecting assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, High Density Printed Circuit Connector, by R. W. Callaway, W. Radzelovage, W. K. Springfield and B. E. Stevens, Vol. 8, No. 3, August 1965, p. 351. *

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889129A (en) * 1972-09-22 1975-06-10 Siemens Ag Direct-current supply connector
US3865452A (en) * 1973-08-01 1975-02-11 Ind Electronic Hardware Corp Spark gap protection in cathode ray tube sockets
DE2949013A1 (de) * 1979-12-06 1981-06-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Uebergang von einem koaxialkabel auf einen mehrpoligen steckverbinder
US4335364A (en) * 1979-12-06 1982-06-15 Licentia Patent-Verwaltungs-Gmbh Transition from a coaxial cable to a multipole plug-in connector
US4308891A (en) * 1980-03-31 1982-01-05 Double A Products Co. Terminal blocks and indicator for solenoid valves
US4398783A (en) * 1981-06-22 1983-08-16 International Telephone & Telegraph Corporation Coaxial cable connector
US4494308A (en) * 1981-07-25 1985-01-22 Kabelmetal Electro Gmbh Connecting a cable to a P.C. board
WO1984002631A1 (en) * 1982-12-29 1984-07-05 Western Electric Co Semiconductor chip package
US4498122A (en) * 1982-12-29 1985-02-05 At&T Bell Laboratories High-speed, high pin-out LSI chip package
EP0145083A3 (de) * 1983-12-02 1987-07-29 E.I. Du Pont De Nemours And Company Elektrischer Verbinder versehen mit einer flexiblen Schaltung, die eine Anordnung zur Impedanzsteuerung besitzt
US4552420A (en) * 1983-12-02 1985-11-12 E. I. Du Pont De Nemours And Company Electrical connector using a flexible circuit having an impedance control arrangement thereon
US4600256A (en) * 1984-12-31 1986-07-15 Motorola, Inc. Condensed profile electrical connector
US4610495A (en) * 1985-03-07 1986-09-09 Rogers Corporation Solderless connector apparatus and method of making the same
US4664458A (en) * 1985-09-19 1987-05-12 C W Industries Printed circuit board connector
EP0243021A1 (de) * 1986-04-21 1987-10-28 Micro Component Technology, Inc. Impedanzanpassungsmittel
EP0291620A3 (de) * 1986-05-19 1989-11-29 United Technologies Corporation Lötfreie, eindrückbare Steckverbinder für Hochfrequenz- und Gleichstromverbindungen
US4755147A (en) * 1986-05-20 1988-07-05 Control Data Corporation Flex head connector with ground plane
US4762500A (en) * 1986-12-04 1988-08-09 Amp Incorporated Impedance matched electrical connector
US4747787A (en) * 1987-03-09 1988-05-31 Amp Incorporated Ribbon cable connector
EP0288081A3 (de) * 1987-04-23 1989-03-15 W.L. Gore & Associates GmbH Verbinderabschirmung für elektrische Verbinder
US4839587A (en) * 1988-03-29 1989-06-13 Digital Equipment Corporation Test fixture for tab circuits and devices
US5040998A (en) * 1989-04-20 1991-08-20 Japan Aviation Electronics Industry Limited Plug connector for microstrip line
EP0418045A1 (de) * 1989-09-12 1991-03-20 Nec Corporation Koaxialer Stiftsteckverbinder mit einer Gruppierung von leitenden zylindrischen Hülsen
US5118300A (en) * 1991-05-23 1992-06-02 Amp Incorporated Active electrical connector
US5882227A (en) * 1997-09-17 1999-03-16 Intercon Systems, Inc. Controlled impedance connector block
WO1999056352A3 (en) * 1998-04-29 2000-02-03 Litton Systems Inc High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US6179663B1 (en) 1998-04-29 2001-01-30 Litton Systems, Inc. High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
GB2353908A (en) * 1998-04-29 2001-03-07 Litton Systems Inc High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US6206729B1 (en) 1998-04-29 2001-03-27 Litton Systems, Inc. High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
GB2353908B (en) * 1998-04-29 2002-08-07 Litton Systems Inc High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US6267625B1 (en) 1999-04-21 2001-07-31 Litton Systems, Inc. High density electrical interconnect system having enhanced grounding and cross-talk reduction capability
US20090268749A1 (en) * 2000-03-06 2009-10-29 Juniper Networks, Inc. Enhanced cmts for reliability, availability, and serviceability
US20110200055A1 (en) * 2000-03-06 2011-08-18 Juniper Networks, Inc. Enhanced cmts for reliability, availability, and serviceability
US7953125B2 (en) * 2000-03-06 2011-05-31 Juniper Networks, Inc. Enhanced CMTS for reliability, availability, and serviceability
US6447339B1 (en) * 2001-12-12 2002-09-10 Tektronix, Inc. Adapter for a multi-channel signal probe
CN101834394A (zh) * 2008-10-13 2010-09-15 泰科电子公司 具有信号和同轴触头的连接器装置
US7867032B2 (en) 2008-10-13 2011-01-11 Tyco Electronics Corporation Connector assembly having signal and coaxial contacts
US20100093189A1 (en) * 2008-10-13 2010-04-15 Tyco Electronics Corporation Connector assembly having signal and coaxial contacts
EP2175526A1 (de) * 2008-10-13 2010-04-14 Tyco Electronics Corporation Verbinderanordnung mit Signal- und Koaxialkontakten
US20120077381A1 (en) * 2010-09-23 2012-03-29 Tyco Electronics Corporation Press fit cable connector
US8202121B2 (en) * 2010-09-23 2012-06-19 Tyco Electronics Corporation Press fit cable connector
US20130040499A1 (en) * 2011-08-10 2013-02-14 Hon Hai Precision Industry Co., Ltd. Electrical connector with different contacts sharing a same soldering leg
US8708753B2 (en) * 2011-08-10 2014-04-29 Hon Hai Precision Industry Co., Ltd. Electrical connector with different contacts sharing a same soldering leg
US20150255927A1 (en) * 2012-09-28 2015-09-10 Molex Incorporated Electric connector
US9590358B2 (en) * 2012-09-28 2017-03-07 Molex, Llc Electrical connector having staggered pins

Also Published As

Publication number Publication date
BE762669A (fr) 1971-08-09
NL7101204A (de) 1971-08-11
GB1280794A (en) 1972-07-05
ES387879A1 (es) 1973-05-16
AT308879B (de) 1973-07-25
JPS5331273B1 (de) 1978-09-01
NL151574B (nl) 1976-11-15
SE360543B (de) 1973-09-24
FR2078323A5 (de) 1971-11-05
DE2104057A1 (de) 1971-08-19

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