AT250472B - Verfahren zum Herstellen von elektrisch leitenden Verbindungswegen in Isolierstoffen - Google Patents

Verfahren zum Herstellen von elektrisch leitenden Verbindungswegen in Isolierstoffen

Info

Publication number
AT250472B
AT250472B AT536464A AT536464A AT250472B AT 250472 B AT250472 B AT 250472B AT 536464 A AT536464 A AT 536464A AT 536464 A AT536464 A AT 536464A AT 250472 B AT250472 B AT 250472B
Authority
AT
Austria
Prior art keywords
electrically conductive
insulating materials
conductive connection
connection paths
producing electrically
Prior art date
Application number
AT536464A
Other languages
English (en)
Original Assignee
Photocircuits Corp
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 Photocircuits Corp filed Critical Photocircuits Corp
Application granted granted Critical
Publication of AT250472B publication Critical patent/AT250472B/de

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/18—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using precipitation techniques to apply the conductive material
    • H05K3/181—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using precipitation techniques to apply the conductive material by electroless plating
    • H05K3/187—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using precipitation techniques to apply the conductive material by electroless plating means therefor, e.g. baths, apparatus
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F1/00—Compounds containing elements of Groups 1 or 11 of the Periodic Table
    • C07F1/005—Compounds containing elements of Groups 1 or 11 of the Periodic Table without C-Metal linkages
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1603—Process or apparatus coating on selected surface areas
    • C23C18/1605—Process or apparatus coating on selected surface areas by masking
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/38—Coating with copper
    • C23C18/40—Coating with copper using reducing agents
    • C23C18/405—Formaldehyde
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/108—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by semi-additive methods; masks therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/422—Plated through-holes or plated via connections characterised by electroless plating method; pretreatment therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
    • H05K3/427—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in metal-clad substrates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
    • H05K3/428—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in substrates having a metal pattern
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0335—Layered conductors or foils
    • H05K2201/0344—Electroless sublayer, e.g. Ni, Co, Cd or Ag; Transferred electroless sublayer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0335—Layered conductors or foils
    • H05K2201/0347—Overplating, e.g. for reinforcing conductors or bumps; Plating over filled vias
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/095—Conductive through-holes or vias
    • H05K2201/09581—Applying an insulating coating on the walls of holes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/05—Patterning and lithography; Masks; Details of resist
    • H05K2203/0562—Details of resist
    • H05K2203/0565—Resist used only for applying catalyst, not for plating itself
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703—Plating
    • H05K2203/072—Electroless plating, e.g. finish plating or initial plating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/13—Moulding and encapsulation; Deposition techniques; Protective layers
    • H05K2203/1377—Protective layers
    • H05K2203/1383—Temporary protective insulating layer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/14—Related to the order of processing steps
    • H05K2203/1423—Applying catalyst before etching, e.g. plating catalyst in holes before etching circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0094—Filling or covering plated through-holes or blind plated vias, e.g. for masking or for mechanical reinforcement
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
    • H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
    • H05K3/061—Etching masks
    • H05K3/064—Photoresists

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Chemically Coating (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
AT536464A 1963-06-21 1964-06-22 Verfahren zum Herstellen von elektrisch leitenden Verbindungswegen in Isolierstoffen AT250472B (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US289633A US3269861A (en) 1963-06-21 1963-06-21 Method for electroless copper plating

Publications (1)

Publication Number Publication Date
AT250472B true AT250472B (de) 1966-11-10

Family

ID=23112377

Family Applications (1)

Application Number Title Priority Date Filing Date
AT536464A AT250472B (de) 1963-06-21 1964-06-22 Verfahren zum Herstellen von elektrisch leitenden Verbindungswegen in Isolierstoffen

Country Status (8)

Country Link
US (1) US3269861A (de)
AT (1) AT250472B (de)
BR (1) BR6460196D0 (de)
CH (1) CH455898A (de)
DE (1) DE1521436B2 (de)
DK (1) DK125903B (de)
GB (1) GB1056814A (de)
NL (1) NL6407079A (de)

Families Citing this family (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1095117A (en) * 1963-12-26 1967-12-13 Matsushita Electric Industrial Co Ltd Method of making printed circuit board
DE1275646B (de) * 1965-05-10 1968-08-22 Siemens Ag Verfahren zur Herstellung einer thermoelektrischen Anordnung
US3415679A (en) * 1965-07-09 1968-12-10 Western Electric Co Metallization of selected regions of surfaces and products so formed
AT310285B (de) * 1966-02-22 1973-09-25 Photocircuits Corp Verfahren zur Herstellung eines Schichtkörpers für gedruckte Schaltungen
US3426427A (en) * 1966-08-01 1969-02-11 Gen Dynamics Corp Internal connection method for circuit boards
US3481777A (en) * 1967-02-17 1969-12-02 Ibm Electroless coating method for making printed circuits
DE1615961A1 (de) * 1967-04-12 1970-06-25 Degussa Verfahren zur Herstellung von gedruckten Schaltungen
FR1577660A (de) * 1967-08-18 1969-08-08
US3640765A (en) * 1969-08-06 1972-02-08 Rca Corp Selective deposition of metal
US3628999A (en) * 1970-03-05 1971-12-21 Frederick W Schneble Jr Plated through hole printed circuit boards
JPS50112231A (de) * 1974-02-15 1975-09-03
US4073981A (en) * 1977-03-11 1978-02-14 Western Electric Company, Inc. Method of selectively depositing metal on a surface
GB2049972B (en) * 1977-07-12 1982-06-23 Asahi Chemical Ind Photosensitive element for producing a printed circuit board
CH632356A5 (de) * 1977-12-15 1982-09-30 Bbc Brown Boveri & Cie Verfahren zur herstellung von metallmustern auf siliziumscheiben fuer die thermomigration.
JPS5494869A (en) * 1978-01-11 1979-07-26 Hitachi Ltd Production of semiconductor device
US4191789A (en) * 1978-11-02 1980-03-04 Bell Telephone Laboratories, Incorporated Fabrication of bi-level circuits
DE2932536A1 (de) * 1979-08-09 1981-02-26 Schering Ag Verfahren zur herstellung von gedruckten schaltungen
US4392013A (en) * 1979-12-27 1983-07-05 Asahi Kasei Kogyo Kabushiki Kaisha Fine-patterned thick film conductor structure and manufacturing method thereof
USH325H (en) 1980-07-30 1987-09-01 Richardson Chemical Company Electroless deposition of transition metals
DE3121131C2 (de) * 1981-05-27 1984-02-16 ANT Nachrichtentechnik GmbH, 7150 Backnang Verfahren zur Herstellung von mit Leiterbahnen versehenen Schaltungsplatten mit metallischen Durchkontaktierungen
DE3279915D1 (en) * 1981-12-11 1989-10-05 Western Electric Co Circuit board fabrication leading to increased capacity
US4593016A (en) * 1985-02-14 1986-06-03 International Business Machines Corporation Process for manufacturing a concentrate of a palladium-tin colloidal catalyst
US5302492A (en) * 1989-06-16 1994-04-12 Hewlett-Packard Company Method of manufacturing printing circuit boards
CA2018208C (en) * 1989-06-16 1995-01-31 Albert Ott Method of manufacturing printed circuit boards
US5355019A (en) * 1992-03-04 1994-10-11 At&T Bell Laboratories Devices with tape automated bonding
US5758412A (en) * 1992-06-11 1998-06-02 Macdermid, Incorporated Method of making a printed circuit board
GB9212395D0 (en) * 1992-06-11 1992-07-22 Knopp John F D Method of making a printed circuit board
GB2284509B (en) * 1993-12-03 1997-11-26 John Frederick David Knopp Method of making a printed circuit board
WO1993026145A1 (en) * 1992-06-11 1993-12-23 John Frederick David Knopp Method of making a printed circuit board
US5840402A (en) * 1994-06-24 1998-11-24 Sheldahl, Inc. Metallized laminate material having ordered distribution of conductive through holes
US5620612A (en) * 1995-08-22 1997-04-15 Macdermid, Incorporated Method for the manufacture of printed circuit boards
GB9520887D0 (en) * 1995-10-12 1995-12-13 Philips Electronics Nv Method of plating through holes of a printed circuit board
US6044550A (en) * 1996-09-23 2000-04-04 Macdermid, Incorporated Process for the manufacture of printed circuit boards
US6023842A (en) * 1996-09-24 2000-02-15 Macdermid, Incorporated Process for the manufacture of printed circuit boards
US5747098A (en) * 1996-09-24 1998-05-05 Macdermid, Incorporated Process for the manufacture of printed circuit boards
US5862010A (en) * 1997-07-08 1999-01-19 International Business Machines Corporation Transducer suspension system
US6518160B1 (en) * 1998-02-05 2003-02-11 Tessera, Inc. Method of manufacturing connection components using a plasma patterned mask
US6162365A (en) * 1998-03-04 2000-12-19 International Business Machines Corporation Pd etch mask for copper circuitization
US6265075B1 (en) 1999-07-20 2001-07-24 International Business Machines Corporation Circuitized semiconductor structure and method for producing such
US20060178007A1 (en) * 2005-02-04 2006-08-10 Hiroki Nakamura Method of forming copper wiring layer
CN102308367B (zh) * 2009-02-06 2015-06-10 Lg化学株式会社 制造绝缘导电图形的方法和层压体
TWI441585B (zh) * 2012-02-29 2014-06-11 Line laminating circuit structure
US9398703B2 (en) 2014-05-19 2016-07-19 Sierra Circuits, Inc. Via in a printed circuit board
US10849233B2 (en) 2017-07-10 2020-11-24 Catlam, Llc Process for forming traces on a catalytic laminate
US10349520B2 (en) 2017-06-28 2019-07-09 Catlam, Llc Multi-layer circuit board using interposer layer and conductive paste
US10765012B2 (en) 2017-07-10 2020-09-01 Catlam, Llc Process for printed circuit boards using backing foil
US10827624B2 (en) 2018-03-05 2020-11-03 Catlam, Llc Catalytic laminate with conductive traces formed during lamination
US11460778B2 (en) * 2018-04-12 2022-10-04 Versum Materials Us, Llc Photoresist stripper
CN109195341A (zh) * 2018-09-12 2019-01-11 安捷利（番禺）电子实业有限公司 一种提高线路铜层厚度和宽度的精密印制电路板的制备方法
CN112312668A (zh) * 2020-10-26 2021-02-02 江西志浩电子科技有限公司 一种使用感光油墨生产外层线路的制作方法
CN115011952B (zh) * 2022-06-10 2023-06-20 江苏富乐华半导体科技股份有限公司 一种预防陶瓷覆铜基板表面化学镀银漏镀的方法

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US2897409A (en) * 1954-10-06 1959-07-28 Sprague Electric Co Plating process
US3119709A (en) * 1956-09-28 1964-01-28 Atkinson Lab Inc Material and method for electroless deposition of metal
US3031344A (en) * 1957-08-08 1962-04-24 Radio Ind Inc Production of electrical printed circuits
US2938805A (en) * 1958-03-31 1960-05-31 Gen Electric Process of stabilizing autocatalytic copper plating solutions
US3075856A (en) * 1958-03-31 1963-01-29 Gen Electric Copper plating process and solution
US3134690A (en) * 1960-02-09 1964-05-26 Eriksson Lars Erik Method for deposition of a copper layer on a non-conductive material
US3095309A (en) * 1960-05-03 1963-06-25 Day Company Electroless copper plating
US3146125A (en) * 1960-05-31 1964-08-25 Day Company Method of making printed circuits

Also Published As

Publication number Publication date
CH455898A (de) 1968-05-15
BR6460196D0 (pt) 1973-12-26
NL6407079A (de) 1964-12-22
DE1521436B2 (de) 1972-10-12
US3269861A (en) 1966-08-30
GB1056814A (en) 1967-02-01
DE1521436A1 (de) 1970-01-08
DK125903B (da) 1973-05-21

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