BR7708186A - Material em camadas,especialmente para componentes de friccao e deslizamento,com uma base de apoio metalica e uma camada de friccao,respectivamente de deslizamento,unida com a base de apoio,e consistindo de materiais sinteticos de grande carga termica admissivel,bem como processo para a fabricacao desses materiais em camadas - Google Patents

Material em camadas,especialmente para componentes de friccao e deslizamento,com uma base de apoio metalica e uma camada de friccao,respectivamente de deslizamento,unida com a base de apoio,e consistindo de materiais sinteticos de grande carga termica admissivel,bem como processo para a fabricacao desses materiais em camadas

Info

Publication number
BR7708186A
BR7708186A BR7708186A BR7708186A BR7708186A BR 7708186 A BR7708186 A BR 7708186A BR 7708186 A BR7708186 A BR 7708186A BR 7708186 A BR7708186 A BR 7708186A BR 7708186 A BR7708186 A BR 7708186A
Authority
BR
Brazil
Prior art keywords
layer
support base
friction
materials
sliding
Prior art date
Application number
BR7708186A
Other languages
English (en)
Portuguese (pt)
Inventor
D Sternisa
E Hodes
Original Assignee
Glyco Metall Werke
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 DE19762656203 external-priority patent/DE2656203A1/de
Priority claimed from DE19772715914 external-priority patent/DE2715914A1/de
Application filed by Glyco Metall Werke filed Critical Glyco Metall Werke
Publication of BR7708186A publication Critical patent/BR7708186A/pt

Links

Classifications

    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/10—Alloys based on copper
    • F16C2204/12—Alloys based on copper with tin as the next major constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/20—Alloys based on aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/20—Alloys based on aluminium
    • F16C2204/24—Alloys based on aluminium with lead as the next major constituent
    • 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
    • Y10S384/00—Bearings
    • Y10S384/90—Cooling or heating
    • Y10S384/907—Bearing material or solid lubricant
    • 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
    • Y10T428/12472—Microscopic interfacial wave or roughness
    • 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
    • Y10T428/12479—Porous [e.g., foamed, spongy, cracked, etc.]
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12708—Sn-base component
    • Y10T428/12715—Next to Group IB metal-base component
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12708—Sn-base component
    • Y10T428/12722—Next to Group VIII metal-base component
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y10T428/12757—Fe
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12903—Cu-base component
    • Y10T428/12917—Next to Fe-base component
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12937—Co- or Ni-base component next to Fe-base component

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Sliding-Contact Bearings (AREA)
  • Chemically Coating (AREA)
  • Laminated Bodies (AREA)
  • Powder Metallurgy (AREA)
  • Electroplating Methods And Accessories (AREA)
BR7708186A 1976-12-11 1977-12-09 Material em camadas,especialmente para componentes de friccao e deslizamento,com uma base de apoio metalica e uma camada de friccao,respectivamente de deslizamento,unida com a base de apoio,e consistindo de materiais sinteticos de grande carga termica admissivel,bem como processo para a fabricacao desses materiais em camadas BR7708186A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19762656203 DE2656203A1 (de) 1976-12-11 1976-12-11 Schichtwerkstoff und verfahren zu seiner herstellung mittels thermokinetischen plattierens
DE19772715914 DE2715914A1 (de) 1977-04-09 1977-04-09 Schichtwerkstoff und verfahren zu seiner herstellung mittels thermokinetischen plattierens

Publications (1)

Publication Number Publication Date
BR7708186A true BR7708186A (pt) 1978-08-15

Family

ID=25771244

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7708186A BR7708186A (pt) 1976-12-11 1977-12-09 Material em camadas,especialmente para componentes de friccao e deslizamento,com uma base de apoio metalica e uma camada de friccao,respectivamente de deslizamento,unida com a base de apoio,e consistindo de materiais sinteticos de grande carga termica admissivel,bem como processo para a fabricacao desses materiais em camadas

Country Status (9)

Country Link
US (1) US4308321A (OSRAM)
JP (1) JPS6039748B2 (OSRAM)
AR (1) AR214222A1 (OSRAM)
BR (1) BR7708186A (OSRAM)
ES (1) ES464859A1 (OSRAM)
FR (1) FR2373355A1 (OSRAM)
GB (1) GB1598361A (OSRAM)
IT (1) IT1087793B (OSRAM)
PL (1) PL202872A1 (OSRAM)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3242543C2 (de) * 1982-11-18 1985-09-19 Glyco-Metall-Werke Daelen & Loos Gmbh, 6200 Wiesbaden Schichtwerkstoff mit einer auf einer metallischen Trägerschicht aufgebrachten Funktionsschicht aus metallischer Suspensionslegierung und Verfahren zu seiner Herstellung
DE3501410A1 (de) * 1985-01-17 1986-07-17 Linde Ag, 6200 Wiesbaden Verfahren zum auftragen von lot
US4754494A (en) * 1985-07-18 1988-06-28 The Charles Stark Draper Laboratory, Inc. Beryllium based, wear-resistant material for bearings and the like
GB8802627D0 (en) * 1988-02-05 1988-03-02 Boc Group Inc Liquid-vapour contact columns
JPH0726088B2 (ja) * 1988-12-23 1995-03-22 三菱電機株式会社 高摩擦摺動材
DE4342436C2 (de) * 1992-12-23 1997-01-30 Renk Ag Gleitlager mit einer Lagerschale
WO1995028267A1 (en) * 1994-04-15 1995-10-26 Dana Corporation A polymeric based composite bearing
GB2295837B (en) * 1994-12-10 1998-09-02 Camco Drilling Group Ltd Improvements in or relating to elements faced with superhard material
GB9811456D0 (en) * 1998-05-29 1998-07-29 Rolls Royce Plc A metallic article having a thermal barrier coating and a method of application thereof
US7355418B2 (en) 2004-02-12 2008-04-08 Applied Materials, Inc. Configurable prober for TFT LCD array test
US8338317B2 (en) * 2011-04-06 2012-12-25 Infineon Technologies Ag Method for processing a semiconductor wafer or die, and particle deposition device
ITMI20131907A1 (it) * 2013-11-18 2015-05-19 Cave S R L Cuscinetto a strisciamento per l'ingegneria strutturale
AT517721B1 (de) * 2016-01-28 2017-04-15 Miba Gleitlager Austria Gmbh Verfahren zur Herstellung eines Gleitlagerelementes
CN110546312A (zh) * 2017-05-16 2019-12-06 住友电气工业株式会社 一种镀铝膜及用于制备镀铝膜的方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178149A (en) * 1938-12-19 1939-10-31 Detroit Aluminum & Brass Corp Bearing combination
US2424557A (en) * 1944-06-27 1947-07-29 Gen Motors Corp Composite article and method of manufacture
US2525887A (en) * 1946-03-21 1950-10-17 Jack & Heintz Prec Ind Inc Plain bearing
US2765520A (en) * 1952-11-14 1956-10-09 Gen Motors Corp Bearing and method of making the same
US2833667A (en) * 1954-06-07 1958-05-06 Noel L Dalton Method of lining a bearing shell
US2977673A (en) * 1955-09-22 1961-04-04 Gen Motors Corp Method of forming composite metal bearings
US3004333A (en) * 1957-06-18 1961-10-17 Clevite Corp Bearing and method of making same
US3147087A (en) * 1959-02-19 1964-09-01 Gen Electric Controlled density heterogeneous material and article
US3150940A (en) * 1960-03-01 1964-09-29 Cincinnati Milling Machine Co Bearing surface and method of producing said surface
US3285680A (en) * 1963-06-26 1966-11-15 Helen G Dailey Bearing
DE1273826B (de) * 1963-08-20 1968-07-25 Erdoelchemie Gmbh Verfahren zur Herstellung poroeser Metallkoerper, insbesondere zur Verwendung als Katalysatoren
US3350773A (en) * 1963-09-11 1967-11-07 Federal Mogul Bower Bearings Method of making bearings
US3403010A (en) * 1966-02-14 1968-09-24 Clevite Corp Multilayer bearing having a base of steel and a surface layer of a lead alloy
US3505104A (en) * 1966-10-27 1970-04-07 Ampco Metal Inc Method of forming an aluminum bronze article
US3553806A (en) * 1968-01-04 1971-01-12 Clevite Corp Bearing and method of making same
US3623205A (en) * 1969-12-24 1971-11-30 Curtiss Wright Corp Composite bearing structure
US3788823A (en) * 1971-04-21 1974-01-29 Ethyl Corp Brazed foamed metal

Also Published As

Publication number Publication date
GB1598361A (en) 1981-09-16
JPS53114710A (en) 1978-10-06
IT1087793B (it) 1985-06-04
FR2373355A1 (fr) 1978-07-07
FR2373355B3 (OSRAM) 1980-09-05
ES464859A1 (es) 1978-11-01
US4308321A (en) 1981-12-29
JPS6039748B2 (ja) 1985-09-07
AR214222A1 (es) 1979-05-15
PL202872A1 (pl) 1978-10-23

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