NL7704770A - Werkwijze voor het aanbrengen van afstandstukjes op een isolerend substraat. - Google Patents
Werkwijze voor het aanbrengen van afstandstukjes op een isolerend substraat.Info
- Publication number
- NL7704770A NL7704770A NL7704770A NL7704770A NL7704770A NL 7704770 A NL7704770 A NL 7704770A NL 7704770 A NL7704770 A NL 7704770A NL 7704770 A NL7704770 A NL 7704770A NL 7704770 A NL7704770 A NL 7704770A
- Authority
- NL
- Netherlands
- Prior art keywords
- procedure
- insulating substrate
- applying spacers
- spacers
- applying
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title 1
Classifications
-
- 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
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4803—Insulating or insulated parts, e.g. mountings, containers, diamond heatsinks
-
- 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
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/303—Surface mounted components, e.g. affixing before soldering, aligning means, spacing means
-
- 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
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
-
- 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
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/8112—Aligning
- H01L2224/81136—Aligning involving guiding structures, e.g. spacers or supporting members
-
- 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
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/818—Bonding techniques
- H01L2224/81801—Soldering or alloying
-
- 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
- H01L2924/01005—Boron [B]
-
- 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
- H01L2924/01006—Carbon [C]
-
- 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
- H01L2924/01013—Aluminum [Al]
-
- 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
- H01L2924/01033—Arsenic [As]
-
- 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
- H01L2924/01046—Palladium [Pd]
-
- 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
- H01L2924/01047—Silver [Ag]
-
- 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
- H01L2924/01067—Holmium [Ho]
-
- 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
- H01L2924/01076—Osmium [Os]
-
- 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
- H01L2924/013—Alloys
- H01L2924/014—Solder alloys
-
- 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
-
- 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
- H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
- H01L2924/1901—Structure
- H01L2924/1904—Component type
- H01L2924/19041—Component type being a capacitor
-
- 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
- H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
- H01L2924/1901—Structure
- H01L2924/1904—Component type
- H01L2924/19043—Component type being a resistor
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
-
- 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
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09909—Special local insulating pattern, e.g. as dam around component
-
- 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
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10166—Transistor
-
- 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
- H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
- H05K2201/2036—Permanent spacer or stand-off in a printed circuit or printed circuit assembly
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
- Y10T29/49144—Assembling to base an electrical component, e.g., capacitor, etc. by metal fusion
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Casings For Electric Apparatus (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Combinations Of Printed Boards (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7704770A NL7704770A (nl) | 1977-05-02 | 1977-05-02 | Werkwijze voor het aanbrengen van afstandstukjes op een isolerend substraat. |
DE2817286A DE2817286C2 (de) | 1977-05-02 | 1978-04-20 | Verfahren zum Anbringen von Distanzgliedern auf Hybrid-Schaltungen |
US05/898,653 US4184043A (en) | 1977-05-02 | 1978-04-21 | Method of providing spacers on an insulating substrate |
CA302,120A CA1112371A (en) | 1977-05-02 | 1978-04-27 | Method of providing spacers on an insulating substrate |
AU35568/78A AU513792B2 (en) | 1977-05-02 | 1978-04-28 | Method of providing spacers ona substrate |
FR7812638A FR2390005B1 (nl) | 1977-05-02 | 1978-04-28 | |
JP5019778A JPS53135462A (en) | 1977-05-02 | 1978-04-28 | Method of providing spacer on insulated board |
IT7822878A IT1094980B (it) | 1977-05-02 | 1978-04-28 | Metodo per la formazione di distanziatori su di un substrato isolante |
GB16954/78A GB1583288A (en) | 1977-05-02 | 1978-04-28 | Mounting of an electrical component in an electrical circuit on an insulating substrate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7704770A NL7704770A (nl) | 1977-05-02 | 1977-05-02 | Werkwijze voor het aanbrengen van afstandstukjes op een isolerend substraat. |
Publications (1)
Publication Number | Publication Date |
---|---|
NL7704770A true NL7704770A (nl) | 1978-11-06 |
Family
ID=19828467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL7704770A NL7704770A (nl) | 1977-05-02 | 1977-05-02 | Werkwijze voor het aanbrengen van afstandstukjes op een isolerend substraat. |
Country Status (9)
Country | Link |
---|---|
US (1) | US4184043A (nl) |
JP (1) | JPS53135462A (nl) |
AU (1) | AU513792B2 (nl) |
CA (1) | CA1112371A (nl) |
DE (1) | DE2817286C2 (nl) |
FR (1) | FR2390005B1 (nl) |
GB (1) | GB1583288A (nl) |
IT (1) | IT1094980B (nl) |
NL (1) | NL7704770A (nl) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2452786A1 (fr) * | 1979-03-30 | 1980-10-24 | Silicium Semiconducteur Ssc | Procede de montage par soudage d'une pastille semi-conductrice sur un radiateur et dispositif obtenu |
US4391845A (en) * | 1981-11-19 | 1983-07-05 | Oak Industries Inc. | Method of making a membrane switch |
US4545610A (en) * | 1983-11-25 | 1985-10-08 | International Business Machines Corporation | Method for forming elongated solder connections between a semiconductor device and a supporting substrate |
US4641222A (en) * | 1984-05-29 | 1987-02-03 | Motorola, Inc. | Mounting system for stress relief in surface mounted components |
JPS6255996A (ja) * | 1985-09-05 | 1987-03-11 | 日本電気株式会社 | 配線基板 |
DE3534502A1 (de) * | 1985-09-27 | 1987-04-09 | Licentia Gmbh | Verfahren zum herstellen einer klebekontaktierung |
US4777564A (en) * | 1986-10-16 | 1988-10-11 | Motorola, Inc. | Leadform for use with surface mounted components |
JPH02117196A (ja) * | 1988-10-26 | 1990-05-01 | Canon Inc | プリント基板 |
US5045142A (en) * | 1989-11-22 | 1991-09-03 | Xerox Corporation | Stand-off structure for flipped chip butting |
US5001829A (en) * | 1990-01-02 | 1991-03-26 | General Electric Company | Method for connecting a leadless chip carrier to a substrate |
JPH0563029A (ja) * | 1991-09-02 | 1993-03-12 | Fujitsu Ltd | 半導体素子 |
JP2555811B2 (ja) * | 1991-09-10 | 1996-11-20 | 富士通株式会社 | 半導体チップのフリップチップ接合方法 |
US5255431A (en) * | 1992-06-26 | 1993-10-26 | General Electric Company | Method of using frozen epoxy for placing pin-mounted components in a circuit module |
DE4228012C2 (de) * | 1992-08-24 | 1996-08-22 | Siemens Ag | Verfahren zum Beabstanden zweier Bauteile |
US5573172A (en) * | 1993-11-08 | 1996-11-12 | Sawtek, Inc. | Surface mount stress relief hidden lead package device and method |
DE9411391U1 (de) * | 1994-07-14 | 1995-11-16 | Gira Giersiepen Gmbh & Co Kg, 42477 Radevormwald | Elektro-Installationsgerät |
DE19518027C2 (de) * | 1995-05-17 | 1997-05-15 | Lust Hybrid Technik Gmbh | Verfahren zur abstandsgenauen Umhüllung mit funktionstragenden Schichten versehener Bauelemente und danach hergestellte Bauelemente |
JPH097660A (ja) * | 1995-06-22 | 1997-01-10 | Yazaki Corp | 信号伝達装置 |
DE19533251A1 (de) * | 1995-06-27 | 1997-01-02 | Braun Ag | Verfahren zur wärmeleitenden Befestigung eines elektronischen Leistungsbauelementes auf einer Leiterplatte mit einem Kühlblech oder Kühlkörper |
EP0751562B1 (de) * | 1995-06-27 | 2001-07-18 | Braun GmbH | Wärmeleite-Befestigung eines elektronischen Leistungsbauelementes auf einer Leiterplatte mit Kühlblech |
DE19750073A1 (de) * | 1997-11-12 | 1999-05-20 | Bosch Gmbh Robert | Schaltungsträgerplatte |
US6086705A (en) * | 1998-09-14 | 2000-07-11 | Industrial Technology Research Institute | Bonding of micro elements |
DE10030697C2 (de) * | 2000-06-23 | 2002-06-27 | Infineon Technologies Ag | Verfahren zum Befestigen eines Halbleiterchips auf einem Substrat |
US7518223B2 (en) * | 2001-08-24 | 2009-04-14 | Micron Technology, Inc. | Semiconductor devices and semiconductor device assemblies including a nonconfluent spacer layer |
US7109583B2 (en) * | 2004-05-06 | 2006-09-19 | Endwave Corporation | Mounting with auxiliary bumps |
DE102004037610B3 (de) | 2004-08-03 | 2006-03-16 | Infineon Technologies Ag | Verfahren zur Verbindung einer integrierten Schaltung mit einem Substrat und entsprechende Schaltungsanordnung |
DE102004039853A1 (de) * | 2004-08-17 | 2006-03-09 | Siemens Ag | Elektrische Baueinheit und Verfahren zum Herstellen einer solchen Baueinheit |
US7745301B2 (en) * | 2005-08-22 | 2010-06-29 | Terapede, Llc | Methods and apparatus for high-density chip connectivity |
US8957511B2 (en) * | 2005-08-22 | 2015-02-17 | Madhukar B. Vora | Apparatus and methods for high-density chip connectivity |
DE102005050830A1 (de) * | 2005-10-24 | 2007-04-26 | Tridonicatco Gmbh & Co. Kg | Beabstandung von Bauelementen auf der Bestückungsfläche einer Leiterplatte |
JP6570728B2 (ja) * | 2016-02-18 | 2019-09-04 | 三菱電機株式会社 | 電子装置およびその製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3098287A (en) * | 1958-07-22 | 1963-07-23 | Hazeltine Research Inc | Method of assembling components on printed wiring boards |
US3832769A (en) * | 1971-05-26 | 1974-09-03 | Minnesota Mining & Mfg | Circuitry and method |
US3811186A (en) * | 1972-12-11 | 1974-05-21 | Ibm | Method of aligning and attaching circuit devices on a substrate |
-
1977
- 1977-05-02 NL NL7704770A patent/NL7704770A/nl not_active Application Discontinuation
-
1978
- 1978-04-20 DE DE2817286A patent/DE2817286C2/de not_active Expired
- 1978-04-21 US US05/898,653 patent/US4184043A/en not_active Expired - Lifetime
- 1978-04-27 CA CA302,120A patent/CA1112371A/en not_active Expired
- 1978-04-28 IT IT7822878A patent/IT1094980B/it active
- 1978-04-28 AU AU35568/78A patent/AU513792B2/en not_active Expired
- 1978-04-28 GB GB16954/78A patent/GB1583288A/en not_active Expired
- 1978-04-28 JP JP5019778A patent/JPS53135462A/ja active Pending
- 1978-04-28 FR FR7812638A patent/FR2390005B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AU513792B2 (en) | 1981-01-08 |
AU3556878A (en) | 1979-11-01 |
IT1094980B (it) | 1985-08-10 |
FR2390005A1 (nl) | 1978-12-01 |
DE2817286A1 (de) | 1978-11-09 |
FR2390005B1 (nl) | 1983-12-09 |
JPS53135462A (en) | 1978-11-27 |
IT7822878A0 (it) | 1978-04-28 |
CA1112371A (en) | 1981-11-10 |
GB1583288A (en) | 1981-01-21 |
US4184043A (en) | 1980-01-15 |
DE2817286C2 (de) | 1984-03-22 |
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