GB951231A - Improvements in erosion resistant flame-sprayed coatings - Google Patents

Improvements in erosion resistant flame-sprayed coatings

Info

Publication number
GB951231A
GB951231A GB11885/59A GB1188559A GB951231A GB 951231 A GB951231 A GB 951231A GB 11885/59 A GB11885/59 A GB 11885/59A GB 1188559 A GB1188559 A GB 1188559A GB 951231 A GB951231 A GB 951231A
Authority
GB
United Kingdom
Prior art keywords
layer
resin
metal
resistant
primed
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.)
Expired
Application number
GB11885/59A
Other languages
English (en)
Inventor
Ralph Francis Newman Swingler
Ernest Douglas Teague
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.)
DEHAVILLAND AIRCRAFT
De Havilland Aircraft Co Ltd
Norton Grinding Wheel Co Ltd
Original Assignee
DEHAVILLAND AIRCRAFT
De Havilland Aircraft Co Ltd
Norton Grinding Wheel Co Ltd
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 to NL270234D priority Critical patent/NL270234A/xx
Priority to DENDAT1251127D priority patent/DE1251127B/de
Priority to NL250277D priority patent/NL250277A/xx
Application filed by DEHAVILLAND AIRCRAFT, De Havilland Aircraft Co Ltd, Norton Grinding Wheel Co Ltd filed Critical DEHAVILLAND AIRCRAFT
Priority to GB11885/59A priority patent/GB951231A/en
Priority to US15425A priority patent/US3144349A/en
Priority to FR822972A priority patent/FR1253024A/fr
Priority to BE589321A priority patent/BE589321A/fr
Priority to DEH39077A priority patent/DE1180216B/de
Priority to CH392560A priority patent/CH411513A/de
Priority to GB35413/60A priority patent/GB971981A/en
Priority to FR875057A priority patent/FR80657E/fr
Priority to US305490A priority patent/US3325303A/en
Publication of GB951231A publication Critical patent/GB951231A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/26—Construction, shape, or attachment of separate skins, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/16—Blades
    • B64C11/20—Constructional features
    • B64C11/205—Constructional features for protecting blades, e.g. coating
    • 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
    • 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
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • 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
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/08—Flame spraying
    • B05D1/10—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/20—Chromatation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Laminated Bodies (AREA)
GB11885/59A 1959-04-08 1959-04-08 Improvements in erosion resistant flame-sprayed coatings Expired GB951231A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
NL270234D NL270234A (forum.php) 1959-04-08
DENDAT1251127D DE1251127B (de) 1959-04-08 Verfahren zum Überziehen eines metallischen oder nicht metallischen Korpers mit einer erosions bestandigen Schutzschicht durch Flammspritzen
NL250277D NL250277A (forum.php) 1959-04-08
GB11885/59A GB951231A (en) 1959-04-08 1959-04-08 Improvements in erosion resistant flame-sprayed coatings
US15425A US3144349A (en) 1959-04-08 1960-03-16 Removable protective coating for articles of manufacture, such as aeronautical propeller blades
FR822972A FR1253024A (fr) 1959-04-08 1960-03-31 Perfectionnements aux revêtements résistants à l'érosion appliqués par pulvérisation à la flamme sur des métaux
BE589321A BE589321A (fr) 1959-04-08 1960-04-01 Perfectionnements aux revêtements resistants à l'erosion appliques par pulvérisation à la flamme sur des métaux.
DEH39077A DE1180216B (de) 1959-04-08 1960-04-05 Verfahren zum UEberziehen eines Metallkoerpers, insbesondere aus Aluminium, mit einer erosions-bestaendigen Schutzschicht durch Flammspritzen
CH392560A CH411513A (de) 1959-04-08 1960-04-07 Verfahren zum Überziehen eines Metallgegenstandes mit einem Schutzüberzug
GB35413/60A GB971981A (en) 1959-04-08 1960-10-15 Improvements relating to protective flame sprayed coatings
FR875057A FR80657E (fr) 1959-04-08 1961-10-05 Perfectionnements aux revêtements résistants à l'érosion appliqués par pulvérisation à la flamme sur des métaux
US305490A US3325303A (en) 1959-04-08 1963-08-29 Protective flame sprayed coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11885/59A GB951231A (en) 1959-04-08 1959-04-08 Improvements in erosion resistant flame-sprayed coatings

Publications (1)

Publication Number Publication Date
GB951231A true GB951231A (en) 1964-03-04

Family

ID=9994465

Family Applications (2)

Application Number Title Priority Date Filing Date
GB11885/59A Expired GB951231A (en) 1959-04-08 1959-04-08 Improvements in erosion resistant flame-sprayed coatings
GB35413/60A Expired GB971981A (en) 1959-04-08 1960-10-15 Improvements relating to protective flame sprayed coatings

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB35413/60A Expired GB971981A (en) 1959-04-08 1960-10-15 Improvements relating to protective flame sprayed coatings

Country Status (6)

Country Link
US (1) US3144349A (forum.php)
BE (1) BE589321A (forum.php)
CH (1) CH411513A (forum.php)
DE (2) DE1180216B (forum.php)
GB (2) GB951231A (forum.php)
NL (2) NL270234A (forum.php)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227688A (en) * 1988-12-17 1990-08-08 Harold Birkett Improved method for applying protective covering to surfaces
EP0470763A1 (en) * 1990-08-06 1992-02-12 General Electric Company Protective coating for rotor blades
EP1536042A1 (fr) * 2003-11-27 2005-06-01 Airbus France Ensemble comprenant deux pièces métalliques protégées contre la formation d'un couple galvanique
WO2016100425A1 (en) * 2014-12-16 2016-06-23 Ge Oil & Gas Pressure Control Lp System and method of reducing erosion in frac applications
US11149167B1 (en) 2020-04-10 2021-10-19 Formula No. 37, Llc Methods for preparing coating compositions for protecting oilfield operational components

Families Citing this family (31)

* Cited by examiner, † Cited by third party
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US3325303A (en) * 1959-04-08 1967-06-13 Norton Co Protective flame sprayed coatings
US3910719A (en) * 1973-11-02 1975-10-07 Avco Corp Compressor wheel assembly
US3910857A (en) * 1973-11-02 1975-10-07 Avco Corp High compressive strength adhesive
US4111600A (en) * 1976-12-09 1978-09-05 United Technologies Corporation Breakaway fan blade
US4279575A (en) * 1977-11-19 1981-07-21 Rolls-Royce Limited Turbine rotor
US4554195A (en) * 1982-06-10 1985-11-19 Wilbanks International, Inc. Ceramic coated abrasion resistant member and process for making
US4671740A (en) * 1982-06-10 1987-06-09 Wilbanks International, Inc. Ceramic coated abrasion resistant member and process for making
US4564555A (en) * 1982-10-27 1986-01-14 Sermatech International Incorporated Coated part, coating therefor and method of forming same
US4521475A (en) * 1983-04-01 1985-06-04 Riccio Louis M Method and apparatus for applying metal cladding on surfaces and products formed thereby
US4751113A (en) * 1983-04-01 1988-06-14 Riccio Louis M Method and means of applying an antifouling coating on marine hulls
US4618504A (en) * 1983-12-20 1986-10-21 Bosna Alexander A Method and apparatus for applying metal cladding on surfaces and products formed thereby
EP0198092B1 (en) * 1984-10-16 1990-03-28 Nippon Telegraph And Telephone Corporation Surface-treated magnesium or its alloy, and process for the surface treatment
EP0178648B1 (en) * 1984-10-17 1989-07-19 Mitsubishi Rayon Co., Ltd. Undercoat composition and composite molded articles produced usin said compositon
US4714623A (en) * 1985-02-28 1987-12-22 Riccio Louis M Method and apparatus for applying metal cladding on surfaces and products formed thereby
JPS63176453A (ja) * 1987-01-16 1988-07-20 Dainippon Toryo Co Ltd 金属溶射被膜の作製方法
DE69002481T2 (de) * 1989-02-28 1993-12-16 Nippon Paint Co Ltd Verfahren zur Beschichtung von Werkstücken mit Aluminium.
DE4208842C1 (forum.php) * 1992-03-19 1993-04-08 Eurocopter Hubschrauber Gmbh, 8000 Muenchen, De
US5290625A (en) * 1992-05-22 1994-03-01 Davidson Textron Inc. System for making bright aluminum parts
DE19545025A1 (de) * 1995-12-02 1997-06-05 Abb Research Ltd Verfahren zur Aufbringung einer metallischen Haftschicht für keramische Wärmedämmschichten auf metallische Bauteile
AU4901201A (en) * 1999-10-25 2001-07-03 Rolls-Royce Corporation Erosion-resistant coatings for organic matric composites
US20050025896A1 (en) * 2003-08-01 2005-02-03 Grigoriy Grinberg Thermal spray metal on low heat resistant substrates
US7736745B2 (en) 2004-05-24 2010-06-15 Hontek Corporation Abrasion resistant coatings
US20080159870A1 (en) * 2006-12-14 2008-07-03 Hontek Corporation Method and coating for protecting and repairing an airfoil surface using molded boots, sheet or tape
DK1989005T3 (en) 2005-12-14 2018-01-02 Hontek Corp Method and coating to protect and repair a blade surface
US20100008788A1 (en) * 2008-07-14 2010-01-14 Barbee Brent W Protector for a leading edge of an airfoil
US20100154734A1 (en) * 2008-12-19 2010-06-24 Sebright Jason L Method of making a coated article
DK2795104T3 (en) 2011-12-19 2018-09-03 Lm Wind Power Int Tech Ii Aps An erosion screen for a wind turbine blade
US9926793B2 (en) 2013-03-15 2018-03-27 United Technologies Corporation Blades and manufacture methods
CA2992633C (en) * 2015-07-17 2022-05-31 Lm Wp Patent Holding A/S A wind turbine blade having an erosion shield
EP3392501A1 (en) * 2015-12-17 2018-10-24 Emprending Business, S.L.L. Inner covering for wind turbine blades and method for mounting same
CN114182193B (zh) * 2021-10-30 2023-08-11 贵州通用航空有限责任公司 一种轻型飞机螺旋桨用保护层及其制造方法

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US2398108A (en) * 1943-09-25 1946-04-09 Wingfoot Corp Metal coating
US2662831A (en) * 1950-07-19 1953-12-15 Anderson Brass Works Method of bonding copper to aluminum or aluminum alloys
US2707691A (en) * 1952-08-08 1955-05-03 Norton Co Coating metals and other materials with oxide and articles made thereby
US2776225A (en) * 1953-01-16 1957-01-01 Nat Res Corp Process for the production of a highly reflectant, heat resistant wrinkle finish on a base
US2767105A (en) * 1953-04-17 1956-10-16 Nat Res Corp Coating
US2852421A (en) * 1954-06-08 1958-09-16 Johnson & Johnson Adhesive coated metallic sheet and its method of manufacturing
US2913813A (en) * 1955-06-22 1959-11-24 Ohio Commw Eng Co Composite metal product
FR1143847A (fr) * 1956-02-25 1957-10-04 Rech S Et De Fabrications Soc Protection de surfaces métalliques immergées dans l'eau de mer
CH366712A (fr) * 1956-03-09 1963-01-15 Norton Co Objet et procédé de fabrication de celui-ci
FR1172867A (fr) * 1956-03-09 1959-02-17 Norton Co Objet composite, et procédé pour revêtir des matières rigides afin de les protéger de l'oxydation
NL213657A (forum.php) * 1956-08-14

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227688A (en) * 1988-12-17 1990-08-08 Harold Birkett Improved method for applying protective covering to surfaces
GB2227688B (en) * 1988-12-17 1993-08-18 Harold Birkett Improved method for applying protective covering to surfaces
EP0470763A1 (en) * 1990-08-06 1992-02-12 General Electric Company Protective coating for rotor blades
US5137426A (en) * 1990-08-06 1992-08-11 General Electric Company Blade shroud deformable protective coating
EP1536042A1 (fr) * 2003-11-27 2005-06-01 Airbus France Ensemble comprenant deux pièces métalliques protégées contre la formation d'un couple galvanique
FR2862985A1 (fr) * 2003-11-27 2005-06-03 Airbus France Ensemble comprenant deux pieces metalliques protegees contre la formation d'un couple galvanique
WO2016100425A1 (en) * 2014-12-16 2016-06-23 Ge Oil & Gas Pressure Control Lp System and method of reducing erosion in frac applications
US10151188B2 (en) 2014-12-16 2018-12-11 Ge Oil & Gas Pressure Control Lp System and method of reducing erosion in frac applications
US11446700B1 (en) 2020-04-10 2022-09-20 S+S Industries Technology Llc Methods for preparing coating compositions for protecting oilfield operational components
US11618055B2 (en) 2020-04-10 2023-04-04 S+S Industries Technology Llc Methods for providing flexible and/or elastic coatings on oilfield operational components
US11149167B1 (en) 2020-04-10 2021-10-19 Formula No. 37, Llc Methods for preparing coating compositions for protecting oilfield operational components
US11484909B1 (en) 2020-04-10 2022-11-01 S+S Industries Technology Llc Coated oilfield operational components and methods for protecting and extending the service life of oilfield operational components
US11559826B2 (en) 2020-04-10 2023-01-24 S+S Industries Technology Llc Methods for providing flexible and/or elastic coatings on oilfield operational components
US11583892B1 (en) 2020-04-10 2023-02-21 S+S Industries Technology Llc Coated oilfield operational components and methods for protecting and extending the service life of oilfield operational components
US11596976B2 (en) 2020-04-10 2023-03-07 S+S Industries Technology Llc Methods for preparing coating compositions for protecting oilfield operational components
US11413652B2 (en) 2020-04-10 2022-08-16 Formula No. 37, Llc Coated oilfield operational components and methods for protecting and extending the service life of oilfield operational components
US11826780B2 (en) 2020-04-10 2023-11-28 S+S Industries Technology Llc Methods for providing flexible and/or elastic coatings on oilfield operational components
US11845107B2 (en) 2020-04-10 2023-12-19 S+S Industries Technology Llc Methods for protecting oilfield operational components from damage from fluid flow
US12059706B2 (en) 2020-04-10 2024-08-13 S+S Industries Technology Llc Methods for preparing coating compositions for protecting oilfield operational components
US12059705B2 (en) 2020-04-10 2024-08-13 S+S Industries Technology Llc Coating and methods for extending service life of oilfield operational components
US12128442B2 (en) 2020-04-10 2024-10-29 S+S Industries Technology Llc Coated fluid handling components and methods for protecting and extending the service life of fluid handling components
US12220725B2 (en) 2020-04-10 2025-02-11 S+S Industries Technology Llc Coated oilfield operational components and methods for protecting and extending the service life of oilfield operational components

Also Published As

Publication number Publication date
NL270234A (forum.php) 1900-01-01
US3144349A (en) 1964-08-11
NL250277A (forum.php) 1900-01-01
CH411513A (de) 1966-04-15
DE1251127B (de) 1967-09-28
BE589321A (fr) 1960-10-03
DE1180216B (de) 1964-10-22
GB971981A (en) 1964-10-07

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