FR2373500A1 - Matieres composites a base de carbure fritte pour operations de terrassement et de mine, et leur procede de preparation - Google Patents

Matieres composites a base de carbure fritte pour operations de terrassement et de mine, et leur procede de preparation

Info

Publication number
FR2373500A1
FR2373500A1 FR7734954A FR7734954A FR2373500A1 FR 2373500 A1 FR2373500 A1 FR 2373500A1 FR 7734954 A FR7734954 A FR 7734954A FR 7734954 A FR7734954 A FR 7734954A FR 2373500 A1 FR2373500 A1 FR 2373500A1
Authority
FR
France
Prior art keywords
composite materials
earthworking
carbide
preparation process
carbide composite
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.)
Granted
Application number
FR7734954A
Other languages
English (en)
French (fr)
Other versions
FR2373500B1 (US08188275-20120529-C00054.png
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of FR2373500A1 publication Critical patent/FR2373500A1/fr
Application granted granted Critical
Publication of FR2373500B1 publication Critical patent/FR2373500B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools
    • 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
    • B22F7/06—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 workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—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 workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/285—Teeth characterised by the material used
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1833—Multiple inserts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1835—Chemical composition or specific material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2204/00—End product comprising different layers, coatings or parts of cermet
    • 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.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12576—Boride, carbide or nitride component

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Composite Materials (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Powder Metallurgy (AREA)
  • Ceramic Products (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
FR7734954A 1976-12-10 1977-11-21 Matieres composites a base de carbure fritte pour operations de terrassement et de mine, et leur procede de preparation Granted FR2373500A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/749,343 US4101318A (en) 1976-12-10 1976-12-10 Cemented carbide-steel composites for earthmoving and mining applications

Publications (2)

Publication Number Publication Date
FR2373500A1 true FR2373500A1 (fr) 1978-07-07
FR2373500B1 FR2373500B1 (US08188275-20120529-C00054.png) 1983-11-25

Family

ID=25013331

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7734954A Granted FR2373500A1 (fr) 1976-12-10 1977-11-21 Matieres composites a base de carbure fritte pour operations de terrassement et de mine, et leur procede de preparation

Country Status (10)

Country Link
US (1) US4101318A (US08188275-20120529-C00054.png)
JP (1) JPS5372710A (US08188275-20120529-C00054.png)
AT (1) AT352641B (US08188275-20120529-C00054.png)
AU (1) AU504992B2 (US08188275-20120529-C00054.png)
BR (1) BR7707794A (US08188275-20120529-C00054.png)
CA (1) CA1087878A (US08188275-20120529-C00054.png)
DE (1) DE2754999C2 (US08188275-20120529-C00054.png)
FR (1) FR2373500A1 (US08188275-20120529-C00054.png)
GB (1) GB1597715A (US08188275-20120529-C00054.png)
SE (1) SE7714037L (US08188275-20120529-C00054.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2391016A1 (fr) * 1977-05-20 1978-12-15 Permanence Corp Procede de realisation de structures composites en metal et carbure metallique
FR2504426A1 (fr) * 1981-04-27 1982-10-29 Kennametal Inc Piece coulee comportant des parties compactes, resistantes a l'usure et procede de fabrication d'une telle piece
WO1982004375A1 (en) * 1981-06-09 1982-12-23 Real Michael William Wear-resistant materials
EP0106929A2 (en) * 1982-09-27 1984-05-02 Acu-Edge, Inc. Wear-resistant and shock-resistant tools and method of manufacture thereof
FR2667088A1 (fr) * 1990-09-20 1992-03-27 Technogenia Sa Dent pour outil d'excavation.
EP0510977A1 (en) * 1991-04-26 1992-10-28 Daido Tokushuko Kabushiki Kaisha High Young's modulus materials and surface-coated tool members using the same

Families Citing this family (55)

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US4216034A (en) * 1977-07-27 1980-08-05 Sumitomo Electric Industries, Ltd. Process for the production of a hard solid solution
SE425003B (sv) * 1978-02-28 1982-08-23 Sandvik Ab Modifikation av molybden-volfram-karbonitrid enligt kraven i patentet 7800756-4
US4257809A (en) * 1979-01-05 1981-03-24 General Electric Company Molybdenum monocarbide-tungsten monocarbide solid solutions
US4650722A (en) * 1980-06-13 1987-03-17 Union Carbide Corporation Hard faced article
US4484644A (en) * 1980-09-02 1984-11-27 Ingersoll-Rand Company Sintered and forged article, and method of forming same
DE3123963C2 (de) * 1981-06-19 1985-05-15 Berchem & Schaberg Gmbh, 4650 Gelsenkirchen Gesteinsschneidkopf für einen Schneidkopf-Saugbagger
US4454205A (en) * 1981-10-09 1984-06-12 Esco Corporation Method of drill bit manufacture and product
SE449383B (sv) * 1982-12-06 1987-04-27 Sandvik Ab Slitdetaljer sasom snoplogsker, veghyvelsker, grevtender m m med hog slitstyrka
SE450259C (sv) * 1983-03-23 1996-07-22 Sandvik Ab Verktyg för brytning eller avverkning av fasta material, såsom asfalt
SE440753B (sv) * 1983-05-13 1985-08-19 Santrade Ltd Verktyg for skerande bearbetning bestaende av kerna och holje
US4770253A (en) * 1987-02-20 1988-09-13 Kennametal Inc. Grader blade with tiered inserts on leading edge
US4859543A (en) * 1987-04-28 1989-08-22 Kennametal Inc. Earth working tool having a working element fabricated from cemented tungsten carbide compositions with enhanced properties
US4954058A (en) * 1988-06-27 1990-09-04 Deere & Company Method for making composite sintered apex seal material
US4956012A (en) * 1988-10-03 1990-09-11 Newcomer Products, Inc. Dispersion alloyed hard metal composites
US5066546A (en) * 1989-03-23 1991-11-19 Kennametal Inc. Wear-resistant steel castings
US5057147A (en) * 1990-06-15 1991-10-15 Gte Products Corporation Method for preparation of WC-NI grade powder
US5111600A (en) * 1991-07-30 1992-05-12 Caterpillar Inc. Tooth with hard material applied to selected surfaces
DE4221085A1 (de) * 1992-06-26 1994-01-05 Lausitzer Braunkohle Ag Schneidenelement zum Lösen von Gestein
US5423899A (en) * 1993-07-16 1995-06-13 Newcomer Products, Inc. Dispersion alloyed hard metal composites and method for producing same
US5427186A (en) * 1993-12-20 1995-06-27 Caterpillar Inc. Method for forming wear surfaces and the resulting part
US5403544A (en) * 1993-12-20 1995-04-04 Caterpillar Inc. Method for forming hard particle wear surfaces
US5502905A (en) * 1994-04-26 1996-04-02 Caterpillar Inc. Tooth having abrasion resistant material applied thereto
DE4431563A1 (de) * 1994-09-05 1996-03-07 Kloeckner Humboldt Deutz Ag Verschleißfeste Oberflächenpanzerung für die Walzen von Hochdruck-Walzenpressen zur Druckzerkleinerung körnigen Gutes (Unterlagen zu P 44 44 337.4 gegeben)
SE515213C2 (sv) * 1995-02-08 2001-07-02 Sandvik Ab Belagd titanbaserad karbonitrid
US5841045A (en) * 1995-08-23 1998-11-24 Nanodyne Incorporated Cemented carbide articles and master alloy composition
WO1997044994A1 (en) * 1996-05-24 1997-12-04 Kennametal Inc. Plow blade
US5865385A (en) * 1997-02-21 1999-02-02 Arnett; Charles R. Comminuting media comprising martensitic/austenitic steel containing retained work-transformable austenite
GB2374824B (en) * 1997-08-19 2003-04-02 Cutting & Wear Resistant Dev Substrate facing of drill string components
EP0923851A1 (de) * 1997-12-19 1999-06-23 RDZ DUTZI GmbH Lockerungsschar für ein Bodenbearbeitungsgerät
GB2345036B (en) * 1998-12-24 2002-07-10 Bernard Mccartney Ltd Vehicle wheel tooth
US8323372B1 (en) * 2000-01-31 2012-12-04 Smith International, Inc. Low coefficient of thermal expansion cermet compositions
US6571889B2 (en) 2000-05-01 2003-06-03 Smith International, Inc. Rotary cone bit with functionally-engineered composite inserts
TW528635B (en) * 2000-11-20 2003-04-21 Taiwan Union Tool Corp Method of joining a sintered hard alloy member to a stainless steel member and method of making a cutting tool therefrom
AU2003900883A0 (en) * 2003-02-26 2003-03-13 Bradken Resources Pty Limited A steel member and a method of hard-facing thereof
US20050017111A1 (en) * 2003-06-24 2005-01-27 Hickey Jeffrey T. Tool for impinging material having a cast wear pad
US20070217903A1 (en) * 2006-03-14 2007-09-20 Thamboo Samuel V Enhanced bearing durability rotating member method and apparatus
WO2008096213A1 (en) * 2007-02-07 2008-08-14 Sasol-Lurgi Technology Company (Proprietary) Limited Solids handling equipment
AU2008325291B2 (en) * 2007-11-09 2013-10-24 Hyperion Materials & Technologies (Sweden) Ab Casted in cemented carbide components
CN101602106A (zh) * 2008-06-13 2009-12-16 格伦·米勒 含钨戒指制品
US8083011B2 (en) * 2008-09-29 2011-12-27 Sreshta Harold A Matrix turbine sleeve and method for making same
GB0900606D0 (en) 2009-01-15 2009-02-25 Downhole Products Plc Tubing shoe
WO2010136055A1 (en) * 2009-05-29 2010-12-02 Metalogenia S.A. Wear element for earth working machine with enhanced wear resistance
US8517123B2 (en) * 2009-05-29 2013-08-27 Varel International, Ind., L.P. Milling cap for a polycrystalline diamond compact cutter
US8327944B2 (en) * 2009-05-29 2012-12-11 Varel International, Ind., L.P. Whipstock attachment to a fixed cutter drilling or milling bit
RU2544946C2 (ru) * 2009-06-05 2015-03-20 Варел Интернейшнл, Инд., Л.П. Долото обсадной колонны и расширительное долото обсадной колонны
US20110209922A1 (en) * 2009-06-05 2011-09-01 Varel International Casing end tool
US9949539B2 (en) 2010-06-03 2018-04-24 Frederick Goldman, Inc. Method of making multi-coated metallic article
CA2837606A1 (en) 2011-06-03 2012-12-06 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
EP2713803A4 (en) 2011-06-03 2015-03-11 Frederick Goldman Inc COATED METAL PRODUCTS AND MANUFACTURING METHOD THEREFOR
EP2564726B1 (en) * 2011-08-27 2015-01-07 Braun GmbH Method for providing an abrasion resistant cutting edge and trimming device having said cutting edge
EP3401414A1 (en) * 2017-05-11 2018-11-14 Sandvik Intellectual Property AB Cemented carbides comprising an fe-cr binder based metallic binder
DE102019200302A1 (de) * 2019-01-11 2020-07-16 Thyssenkrupp Ag Zahn zum Anbringen an eine Baggerschaufel
DE102019207962B4 (de) * 2019-01-11 2023-07-06 Thyssenkrupp Ag Zahn zum Anbringen an eine Baggerschaufel
CN115515736A (zh) * 2020-05-11 2022-12-23 山特维克Srp股份有限公司 生产包括硬质合金瓦片的复合产品的方法
US11939869B2 (en) * 2020-09-11 2024-03-26 Carriere Industrial Supply Limited Mineral bit and cutting tip therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751608C (de) * 1938-03-25 1952-11-24 Fried Krupp A G Verwendung von gesinterten Hartmetallegierungen
US2743495A (en) * 1951-05-07 1956-05-01 Nat Supply Co Method of making a composite cutter
BE842334A (fr) * 1975-05-29 1976-09-16 Composition a base de carbures metalliques frittes et son procede de preparation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1133089B (de) * 1954-12-07 1962-07-12 Georg Hufnagel Fa Verfahren zum Herstellen von Werkzeugen fuer die spanabhebende Bearbeitung durch Umgiessen gesinterter Koerper, insbesondere Hartmetallkoerper
BE794383A (fr) * 1972-02-14 1973-07-23 Teledyne Ind Alliages de carbures pour outils de coupe
US3790353A (en) * 1972-02-22 1974-02-05 Servco Co Division Smith Int I Hard-facing article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751608C (de) * 1938-03-25 1952-11-24 Fried Krupp A G Verwendung von gesinterten Hartmetallegierungen
US2743495A (en) * 1951-05-07 1956-05-01 Nat Supply Co Method of making a composite cutter
BE842334A (fr) * 1975-05-29 1976-09-16 Composition a base de carbures metalliques frittes et son procede de preparation
FR2312571A1 (fr) * 1975-05-29 1976-12-24 Teledyne Ind Composition a base de carbures metalliques frittes et son procede de preparation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2391016A1 (fr) * 1977-05-20 1978-12-15 Permanence Corp Procede de realisation de structures composites en metal et carbure metallique
FR2504426A1 (fr) * 1981-04-27 1982-10-29 Kennametal Inc Piece coulee comportant des parties compactes, resistantes a l'usure et procede de fabrication d'une telle piece
WO1982004375A1 (en) * 1981-06-09 1982-12-23 Real Michael William Wear-resistant materials
EP0106929A2 (en) * 1982-09-27 1984-05-02 Acu-Edge, Inc. Wear-resistant and shock-resistant tools and method of manufacture thereof
EP0106929A3 (en) * 1982-09-27 1985-05-02 Fred G. Gunzner Wear-resistant and shock-resistant tools and method of manufacture thereof
FR2667088A1 (fr) * 1990-09-20 1992-03-27 Technogenia Sa Dent pour outil d'excavation.
WO1992005320A1 (fr) * 1990-09-20 1992-04-02 Technogenia S.A. Dent pour outil d'excavation
US5375350A (en) * 1990-09-20 1994-12-27 Technogenia S.A. Excavating tool tooth
EP0510977A1 (en) * 1991-04-26 1992-10-28 Daido Tokushuko Kabushiki Kaisha High Young's modulus materials and surface-coated tool members using the same

Also Published As

Publication number Publication date
AU3136277A (en) 1979-06-14
AU504992B2 (en) 1979-11-01
SE7714037L (sv) 1978-06-11
BR7707794A (pt) 1978-09-12
JPS5372710A (en) 1978-06-28
CA1087878A (en) 1980-10-21
DE2754999A1 (de) 1978-08-10
DE2754999C2 (de) 1987-02-19
FR2373500B1 (US08188275-20120529-C00054.png) 1983-11-25
GB1597715A (en) 1981-09-09
AT352641B (de) 1979-09-25
US4101318A (en) 1978-07-18
ATA886977A (de) 1979-02-15

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