NL87258C - - Google Patents

Info

Publication number
NL87258C
NL87258C NL87258DA NL87258C NL 87258 C NL87258 C NL 87258C NL 87258D A NL87258D A NL 87258DA NL 87258 C NL87258 C NL 87258C
Authority
NL
Netherlands
Application number
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.)
Publication of NL87258C publication Critical patent/NL87258C/xx

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/482—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of lead-in layers inseparably applied to the semiconductor body
    • H01L23/485—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of lead-in layers inseparably applied to the semiconductor body consisting of layered constructions comprising conductive layers and insulating layers, e.g. planar contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/023—Alloys based on aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
    • H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
    • H01L23/291—Oxides or nitrides or carbides, e.g. ceramics, glass
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H01L2224/45001—Core members of the connector
    • H01L2224/4501—Shape
    • H01L2224/45012—Cross-sectional shape
    • H01L2224/45015—Cross-sectional shape being circular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H01L2224/45001—Core members of the connector
    • H01L2224/45099—Material
    • H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
    • H01L2224/45117—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 400°C and less than 950°C
    • H01L2224/45124—Aluminium (Al) as principal constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H01L2224/45001—Core members of the connector
    • H01L2224/45099—Material
    • H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
    • H01L2224/45138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
    • H01L2224/45144—Gold (Au) as principal constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/484—Connecting portions
    • H01L2224/4847—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a wedge bond
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/42—Wire connectors; Manufacturing methods related thereto
    • H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/00011—Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01012—Magnesium [Mg]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01014—Silicon [Si]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01019—Potassium [K]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01025—Manganese [Mn]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01039—Yttrium [Y]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01077—Iridium [Ir]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01079—Gold [Au]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/095—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00 with a principal constituent of the material being a combination of two or more materials provided in the groups H01L2924/013 - H01L2924/0715
    • H01L2924/097—Glass-ceramics, e.g. devitrified glass
    • H01L2924/09701—Low temperature co-fired ceramic [LTCC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/12—Passive devices, e.g. 2 terminal devices
    • H01L2924/1203—Rectifying Diode
    • H01L2924/12033—Gunn diode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/13—Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304—Transistor
    • H01L2924/1305—Bipolar Junction Transistor [BJT]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/14—Integrated circuits
    • 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
    • Y10S438/00—Semiconductor device manufacturing: process
    • Y10S438/927—Electromigration resistant metallization
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Conductive Materials (AREA)
NL87258D 1969-01-15 NL87258C (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79137169A 1969-01-15 1969-01-15

Publications (1)

Publication Number Publication Date
NL87258C true NL87258C (de)

Family

ID=25153531

Family Applications (2)

Application Number Title Priority Date Filing Date
NL87258D NL87258C (de) 1969-01-15
NL6918641.A NL167049C (nl) 1969-01-15 1969-12-12 Microschakelelement of geintegreerde schakeling met dunne geleiders en werkwijze ter vervaardiging van deze inrichtingen.

Family Applications After (1)

Application Number Title Priority Date Filing Date
NL6918641.A NL167049C (nl) 1969-01-15 1969-12-12 Microschakelelement of geintegreerde schakeling met dunne geleiders en werkwijze ter vervaardiging van deze inrichtingen.

Country Status (10)

Country Link
US (1) US3725309A (de)
JP (1) JPS4922397B1 (de)
BE (1) BE744429A (de)
CA (1) CA939077A (de)
CH (1) CH502050A (de)
DE (1) DE2001515C3 (de)
FR (1) FR2030151B1 (de)
GB (1) GB1279741A (de)
NL (2) NL167049C (de)
SE (1) SE355475B (de)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848330A (en) * 1972-06-01 1974-11-19 Motorola Inc Electromigration resistant semiconductor contacts and the method of producing same
US3928027A (en) * 1973-03-27 1975-12-23 Us Energy Nonswelling alloy
US3924264A (en) * 1973-05-17 1975-12-02 Ibm Schottky barrier device and circuit application
US4097663A (en) * 1976-01-29 1978-06-27 Stauffer Chemical Company Low fusion copolymer comprising vinyl chloride, vinyl acetate, and bis(hydrocarbyl)vinylphosphonate
US4017890A (en) * 1975-10-24 1977-04-12 International Business Machines Corporation Intermetallic compound layer in thin films for improved electromigration resistance
US3987216A (en) * 1975-12-31 1976-10-19 International Business Machines Corporation Method of forming schottky barrier junctions having improved barrier height
JPS5459080A (en) * 1977-10-19 1979-05-12 Nec Corp Semiconductor device
US4433004A (en) * 1979-07-11 1984-02-21 Tokyo Shibaura Denki Kabushiki Kaisha Semiconductor device and a method for manufacturing the same
JPS5731144A (en) * 1980-07-31 1982-02-19 Fujitsu Ltd Mamufacture of semiconductor device
US4335506A (en) * 1980-08-04 1982-06-22 International Business Machines Corporation Method of forming aluminum/copper alloy conductors
US4373966A (en) * 1981-04-30 1983-02-15 International Business Machines Corporation Forming Schottky barrier diodes by depositing aluminum silicon and copper or binary alloys thereof and alloy-sintering
US4349411A (en) * 1981-10-05 1982-09-14 Bell Telephone Laboratories, Incorporated Etch procedure for aluminum alloy
US4393096A (en) * 1981-11-16 1983-07-12 International Business Machines Corporation Aluminum-copper alloy evaporated films with low via resistance
JPS5884411A (ja) * 1981-11-16 1983-05-20 Tdk Corp 磁気記録媒体の製造方法
GB2131624B (en) * 1982-12-09 1986-07-09 Standard Telephones Cables Ltd Thick film circuits
US4525734A (en) * 1983-03-21 1985-06-25 Syracuse University Hydrogen charged thin film conductor
US4489482A (en) * 1983-06-06 1984-12-25 Fairchild Camera & Instrument Corp. Impregnation of aluminum interconnects with copper
US4549036A (en) * 1984-07-23 1985-10-22 Reichbach Morris M Circular integrated circuit package
DE3782904T2 (de) * 1986-09-17 1993-04-08 Fujitsu Ltd Verfahren zur ausbildung einer kupfer enthaltenden metallisierungsschicht auf der oberflaeche eines halbleiterbauelementes.
US5019891A (en) * 1988-01-20 1991-05-28 Hitachi, Ltd. Semiconductor device and method of fabricating the same
JP2680468B2 (ja) * 1989-07-01 1997-11-19 株式会社東芝 半導体装置および半導体装置の製造方法
US5243221A (en) * 1989-10-25 1993-09-07 At&T Bell Laboratories Aluminum metallization doped with iron and copper to prevent electromigration
US5554889A (en) * 1992-04-03 1996-09-10 Motorola, Inc. Structure and method for metallization of semiconductor devices
EP0606761A3 (de) * 1992-12-28 1995-02-08 Kawasaki Steel Co Halbleitervorrichtung und deren Herstellungsverfahren.
JP3349332B2 (ja) 1995-04-28 2002-11-25 インターナショナル・ビジネス・マシーンズ・コーポレーション 反射式空間光変調素子配列及びその形成方法
JP4083921B2 (ja) * 1998-05-29 2008-04-30 株式会社東芝 半導体装置の製造方法
US6955980B2 (en) * 2002-08-30 2005-10-18 Texas Instruments Incorporated Reducing the migration of grain boundaries
US20100307568A1 (en) * 2009-06-04 2010-12-09 First Solar, Inc. Metal barrier-doped metal contact layer
US11738537B2 (en) 2013-10-30 2023-08-29 San Diego Gas & Electric Company, c/o Sempra Energy Nonconductive films for lighter than air balloons
US20150118460A1 (en) 2013-10-30 2015-04-30 San Diego Gas & Electric company c/o Sempra Energy Nonconductive films for lighter than air balloons

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658757A (en) * 1926-03-19 1928-02-07 Gen Electric Metal composition
US2569149A (en) * 1945-10-19 1951-09-25 Joseph B Brennan Bimetallic structure
US2706680A (en) * 1952-02-27 1955-04-19 Aluminum Co Of America Aluminum base alloy
US3018198A (en) * 1959-08-13 1962-01-23 Resistance Products Company Film resistor and method of making same
US3318758A (en) * 1963-02-18 1967-05-09 Tellite Corp Method of making a printed circuit board which includes low temperature saturation and the product
US3307978A (en) * 1964-02-17 1967-03-07 Dow Chemical Co Process for preparing high strength fabricated articles from aluminum-base alloys containing copper
US3359141A (en) * 1964-02-18 1967-12-19 Pechiney Prod Chimiques Sa Electrical conductors of aluminum and methods for production of same
FR1449426A (fr) * 1964-10-10 1966-08-12 Nippon Electric Co Dispositif semi-conducteurs utilisant une couche d'un composé d'aluminium et d'or
US3360349A (en) * 1965-04-01 1967-12-26 Sperry Rand Corp Copper layer bonded to a non-conductive layer by means of a copper alloy
NL6617141A (de) * 1966-02-11 1967-08-14 Siemens Ag
US3474530A (en) * 1967-02-03 1969-10-28 Ibm Mass production of electronic devices

Also Published As

Publication number Publication date
NL6918641A (de) 1970-07-17
JPS4922397B1 (de) 1974-06-07
BE744429A (fr) 1970-07-14
DE2001515A1 (de) 1970-08-27
DE2001515B2 (de) 1979-08-09
SE355475B (de) 1973-04-16
FR2030151B1 (de) 1974-02-01
NL167049B (nl) 1981-05-15
US3725309A (en) 1973-04-03
GB1279741A (en) 1972-06-28
DE2001515C3 (de) 1984-06-20
FR2030151A1 (de) 1970-10-30
NL167049C (nl) 1981-10-15
CA939077A (en) 1973-12-25
CH502050A (de) 1971-01-15

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