DE1207851B - Verfahren zur Herstellung eines aus einem Stueck bestehenden keramischen Koerpers - Google Patents

Verfahren zur Herstellung eines aus einem Stueck bestehenden keramischen Koerpers

Info

Publication number
DE1207851B
DE1207851B DEG35310A DEG0035310A DE1207851B DE 1207851 B DE1207851 B DE 1207851B DE G35310 A DEG35310 A DE G35310A DE G0035310 A DEG0035310 A DE G0035310A DE 1207851 B DE1207851 B DE 1207851B
Authority
DE
Germany
Prior art keywords
parts
minutes
firing
atmosphere
powder layer
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.)
Pending
Application number
DEG35310A
Other languages
German (de)
English (en)
Inventor
Robert Cooper Folweiler
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of DE1207851B publication Critical patent/DE1207851B/de
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/003—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts
    • C04B37/005—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts consisting of glass or ceramic material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/604—Pressing at temperatures other than sintering temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/658—Atmosphere during thermal treatment
    • C04B2235/6582—Hydrogen containing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/658—Atmosphere during thermal treatment
    • C04B2235/6588—Water vapor containing atmospheres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/661—Multi-step sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/04—Ceramic interlayers
    • C04B2237/06—Oxidic interlayers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/04—Ceramic interlayers
    • C04B2237/06—Oxidic interlayers
    • C04B2237/064—Oxidic interlayers based on alumina or aluminates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • C04B2237/34—Oxidic
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • C04B2237/34—Oxidic
    • C04B2237/343—Alumina or aluminates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
    • C04B2237/704—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the ceramic layers or articles
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
    • C04B2237/708—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the interlayers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/74—Forming laminates or joined articles comprising at least two different interlayers separated by a substrate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
    • C04B2237/765—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc at least one member being a tube
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/80—Joining the largest surface of one substrate with a smaller surface of the other substrate, e.g. butt joining or forming a T-joint

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)
DEG35310A 1961-06-28 1962-06-26 Verfahren zur Herstellung eines aus einem Stueck bestehenden keramischen Koerpers Pending DE1207851B (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US120203A US3239323A (en) 1961-06-28 1961-06-28 Method for sealing ceramics

Publications (1)

Publication Number Publication Date
DE1207851B true DE1207851B (de) 1965-12-23

Family

ID=22388858

Family Applications (1)

Application Number Title Priority Date Filing Date
DEG35310A Pending DE1207851B (de) 1961-06-28 1962-06-26 Verfahren zur Herstellung eines aus einem Stueck bestehenden keramischen Koerpers

Country Status (5)

Country Link
US (1) US3239323A (enExample)
BE (1) BE619512A (enExample)
DE (1) DE1207851B (enExample)
GB (1) GB995285A (enExample)
LU (1) LU41961A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112146A3 (en) * 1982-12-13 1984-12-05 Ngk Insulators, Ltd. Radial blade type ceramic rotor and method of producing the same
DE3436831A1 (de) * 1984-10-06 1986-09-04 Didier-Werke Ag, 6200 Wiesbaden Verfahren und verbindungselement zur verbindung keramischer teile
DE4110141A1 (de) * 1990-03-28 1991-10-02 Ngk Insulators Ltd Verbundener keramikbau

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441421A (en) * 1966-10-24 1969-04-29 Gen Electric Calcia-magnesia-alumina seal compositions
US3564328A (en) * 1968-07-29 1971-02-16 Corning Glass Works Ceramic articles and method of fabrication
US3725186A (en) * 1970-11-25 1973-04-03 Nat Beryllia Corp Composite ceramic articles
US3892598A (en) * 1974-01-07 1975-07-01 Gen Electric Cobalt-rare earth magnets comprising sintered products bonded with solid cobalt-rare earth bonding agents
US3887395A (en) * 1974-01-07 1975-06-03 Gen Electric Cobalt-rare earth magnets comprising sintered products bonded with cobalt-rare earth bonding agents
US4209420A (en) * 1976-12-21 1980-06-24 Asea Aktiebolag Method of containing spent nuclear fuel or high-level nuclear fuel waste
US4333902A (en) * 1977-01-24 1982-06-08 Sumitomo Electric Industries, Ltd. Process of producing a sintered compact
US4340409A (en) * 1979-04-16 1982-07-20 The Bendix Corporation Method of fabricating a pressure sensor
US4334940A (en) * 1979-07-16 1982-06-15 Uop Inc. Method of making solid electrolyte oxygen sensor with integral heater
US4487644A (en) * 1981-10-02 1984-12-11 Kernforschungsanlage J/u/ lich Binderless weld-bonding of preshaped sic-base parts into solid bodies
US4576667A (en) * 1982-12-20 1986-03-18 General Electric Company Process for preparing a sintered ceramic article with porous region
GB8307571D0 (en) * 1983-03-18 1983-04-27 Secr Defence Ceramic waveguides
JPS62170129A (ja) * 1986-01-21 1987-07-27 Ngk Insulators Ltd 高圧金属蒸気放電灯用セラミツク発光管の製造法
DE3705660A1 (de) * 1987-02-21 1988-09-08 Neuenstein Zahnradwerk Verfahren zum herstellen eines reibringes mit einer konischen oder zylindrischen reibflaeche
US4783229A (en) * 1987-04-06 1988-11-08 Gte Products Corporation Ceramic tube
US4780161A (en) * 1987-04-06 1988-10-25 Gte Products Corporation Ceramic tube
US4767479A (en) * 1987-09-21 1988-08-30 United Technologies Corporation Method for bonding ceramic casting cores
US5456833A (en) * 1994-05-02 1995-10-10 Selee Corporation Ceramic foam filter having a protective sleeve
US5954900A (en) * 1996-10-04 1999-09-21 Envec Mess- Und Regeltechnik Gmbh + Co. Process for joining alumina ceramic bodies
US6267835B1 (en) * 1999-07-27 2001-07-31 Eastman Kodak Company Bonding materials using polycrystalline magnesium orthosilicate
AU2002306742A1 (en) * 2001-03-19 2002-10-03 Nutfield Technologies, Inc. Monolithic ceramic laser structure and method of making same
US7695580B2 (en) * 2006-01-17 2010-04-13 Air Products And Chemicals, Inc. Method of forming a ceramic to ceramic joint
US10404030B2 (en) 2015-02-09 2019-09-03 Iradion Laser, Inc. Flat-folded ceramic slab lasers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639258C (de) * 1935-01-01 1938-07-13 Heraeus Gmbh W C Verfahren zum Verschweissen von Rohren und sonstigen Formstuecken aus Quarz und anderen schwer schmelzbaren Stoffen
GB695856A (en) * 1951-03-28 1953-08-19 Brush Dev Co Improvements in or relating to method of cementing ceramic transducers
GB719611A (en) * 1948-08-30 1954-12-08 Lord President Of The Council Improvements in or relating to sintered refractory masses
DE939016C (de) * 1941-05-08 1956-02-09 Eberhard Dr Schneller Verfahren und Anordnung zur Befestigung hocherhitzter Laufschaufeln in einem Laufschaufelring von Waermekraftmaschinen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184370A (en) * 1965-05-18 Ceramic process and product
US2212556A (en) * 1936-01-28 1940-08-27 Lorenz C Ag Method of manufacturing electric discharge tubes
US2248644A (en) * 1937-02-09 1941-07-08 Gen Electric Method of sealing evacuated envelopes
US2279168A (en) * 1940-02-29 1942-04-07 Westinghouse Electric & Mfg Co Process for kovar-glass seals
US2620598A (en) * 1947-04-22 1952-12-09 James A Jobling And Company Lt Method of fabricating multi-component glass articles
US2667427A (en) * 1951-07-27 1954-01-26 Gen Electric Method of metalizing a ceramic member
US2749668A (en) * 1952-08-30 1956-06-12 Csf Method of sealing vacuum-tight envelopes
US2889952A (en) * 1956-02-01 1959-06-09 Corning Glass Works Composite article and method
US3023492A (en) * 1958-11-19 1962-03-06 Gen Electric Metalized ceramic member and composition and method for manufacturing same
US3025204A (en) * 1960-04-07 1962-03-13 Union Carbide Corp Bonding high temperature resistant materials with tungsten hexametaphosphate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639258C (de) * 1935-01-01 1938-07-13 Heraeus Gmbh W C Verfahren zum Verschweissen von Rohren und sonstigen Formstuecken aus Quarz und anderen schwer schmelzbaren Stoffen
DE939016C (de) * 1941-05-08 1956-02-09 Eberhard Dr Schneller Verfahren und Anordnung zur Befestigung hocherhitzter Laufschaufeln in einem Laufschaufelring von Waermekraftmaschinen
GB719611A (en) * 1948-08-30 1954-12-08 Lord President Of The Council Improvements in or relating to sintered refractory masses
GB695856A (en) * 1951-03-28 1953-08-19 Brush Dev Co Improvements in or relating to method of cementing ceramic transducers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112146A3 (en) * 1982-12-13 1984-12-05 Ngk Insulators, Ltd. Radial blade type ceramic rotor and method of producing the same
DE3436831A1 (de) * 1984-10-06 1986-09-04 Didier-Werke Ag, 6200 Wiesbaden Verfahren und verbindungselement zur verbindung keramischer teile
DE4110141A1 (de) * 1990-03-28 1991-10-02 Ngk Insulators Ltd Verbundener keramikbau
DE4110141C2 (de) * 1990-03-28 2000-10-26 Ngk Insulators Ltd Keramik-Verbundaufbau und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
GB995285A (en) 1965-06-16
US3239323A (en) 1966-03-08
LU41961A1 (enExample) 1962-12-28
BE619512A (fr) 1962-12-28

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