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US3011247A - Method of manufacturing printed electrical windings - Google Patents

Method of manufacturing printed electrical windings Download PDF

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Publication number
US3011247A
US3011247A US480099A US48009955A US3011247A US 3011247 A US3011247 A US 3011247A US 480099 A US480099 A US 480099A US 48009955 A US48009955 A US 48009955A US 3011247 A US3011247 A US 3011247A
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US
United States
Prior art keywords
ribbon
coil
printed
winding
insulating
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 - Lifetime
Application number
US480099A
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English (en)
Inventor
Hanlet Jacques Marie Noel
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.)
Visseaux J SA
Original Assignee
Visseaux J SA
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 Visseaux J SA filed Critical Visseaux J SA
Application granted granted Critical
Publication of US3011247A publication Critical patent/US3011247A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/768—Deflecting by magnetic fields only using printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/041—Printed circuit coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/071—Winding coils of special form
    • H01F2041/0711—Winding saddle or deflection coils
    • 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
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring 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
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49078—Laminated

Definitions

  • the present invention relates to a method and means for manufacturing printed electrical windings or coils such as electromagnetic deflecting or electric transformer coils.
  • One of the objects of the invention is to improve the industrial production of such products by providing manufacturing steps which can be readily automatized.
  • Another object of the invention is to provide new industrial products by putting into practice such an irnproved method.
  • a more specific object of the invention is a printed electrical winding consisting principally of a flexible insulating ribbon wound in a coil and bearing on both its sides or faces two series of printed solenoids predeterminedly shifted along this ribbon with respect to each other, with individual solenoids being consecutively and alternatively interconnected from one face to the other. Connections are made by galvanic deposits passing through holes equally distributed along the ribbon, at the respective ends of the solenoids of each series. At the same time the dimensions of the solenoids increase from the inner to the outer end of the coil, depending on both the change in length and diameter of the turns of this coil and on the number of solenoids within each of these turns.
  • the elementary solenoids are serially interconnected in regular alternation from one face to the other of the insulating ribbon; on the other hand, all the solenoids of the coil lying within any determined sectorial portion of the winding and extending from the inner to the outer diameter of this wound coil have a definite covering function.
  • Manufacture of such an electrical winding involves principally the steps of perforating at predetermined intervals a exible insulating ribbon, depositing an electro-conducting lm on both faces thereof and subsequently also on all the edges of tte perforations, depositing thereupon a photosensitive film, printing thereupon simultaneously the negatives of two series of solenoids with a predetermined relative shift, developing, washing and engraving the resulting double-faced drawing, and winding the printed ribbon thus obtained into an insulated coil.
  • FIG. l shows a simplified perspective view of a type of deilecting coil embodying certain features of the invention
  • IFlG. 2 shows simplified flat developments of component parts or sheets in such a deflecting coil
  • FIG. 3 shows an intermediate product to be prepared for carrying out the method of manufacturing coils in accordance with the invention
  • FIG. 4 illustrates schematically the first steps of carrying out tie method of the invention
  • FIG. 5 illustrates schematically some further steps in carrying out the invention
  • FIG. 6 completes FIG. 5;
  • FIG. 7 shows portions of the intermediate product prepared for applying the invention to the manufacture of a transformer winding.
  • an electromagnetic deilecting coil is shown applied around a portion of the neck of a cathode ray tube l.
  • This coil 2 consists of two parts, each represented by a pair of conductor turns, serially interconnected in the usual manner (not shown).
  • the complete winding may be considered as formed by a pile of solenoidal elements, such as shown at 3 and 4 in FIG. 2, in a regular alternation, insulated from each other but electrically connected in series.
  • the first element of the pile is an element such as the electric terminal of its upper' part will be electrically connected to the corresponding terminal of the following element such as shown at e; the lower terminal of element 4 will be electrically connected to the lower terminal of a further element of the type shown at 3, and so forth through the entire pile.
  • the present invention provides a method of manufacturing such an electrical winding which is based upon the spiraling or ceiling of a previously printed ribbon bearing on one face the printing of elements such as shown at 3 and on its other face the printing of elements such as shown at 4.
  • the two series of solenoidal. prints are shifted by with respect to each other and their electrical interconnection is ensured by the manufacturing process itself and, more specifically according to the invention, by the printing process used during this process.
  • the intermediate product to be iirst obtained viz. an insulating ribbon bearing on both faces electrically couducting prints of two series of solenoids, respectively, is shown in lFlG. 3.
  • the face bearing elements 3 is shown at (a) and the other face bearing elements d is shown at (b).
  • These two series of elementary solenoids show a 180 relative shift and are insulated from each other through the tluckness of the insulating ribbon. Since the elementary solenoids shown on face 5 of the ribbon must be electrically connected to those shown on face d, their corresponding inner terminals must be interconnected. ⁇ For this purpose the insulating ribbon is first perforated as indicated in view (a) of FIG. 4.
  • the ribbon consists preferably of plastic material such as polyvinyl, polytetrailuorethylene or the like, 7, and is perforated at points corresponding to intervals or" one-half the circunn ference of the cylindrical member, mandrel, neck or core on which it is arranged in its final state.
  • These holes 4it are disposed at uniform intervals between center points but of progressively increasing dirnensions, taking into account the progressive lengthening of the turns in the coiled product.
  • the thread of these holes must then be related to the side edges of these perforations and not to their center points.
  • the representation of FIG. 4 is exaggerated in this respect for better visualizing this character.
  • an insulating ribbon 7 or" the required length is coiled around a mandrel of a diameter corresponding to the inner diameter of the final coil, and simultaneously spacer ribbons, such as shown at 31 and 32, are coiled together with main ribbon 7.
  • Spacer ribbons 3l, 32 are so designed as to provide an increase of thickness corresponding to the increase of thickness which will be obtained for the final coil of the printed and insulated ribbon.
  • perforations such as shown at 13 and 14, are applied at points diametrically opposed in the conspines? cerned example.
  • the insulating ribbon is taken off the mandrel and presents itself as shown in FIG. 7 at (a). t is then subjected to a two-face metallizing process, for instance by evaporating thereupon a conducting material, for example copper, in vacuum or in neutral atmosphere. in this way an electro-conducting film 9 is obtained, as indicated at (c) in FiG. 4, on both -faces of the insulating ribbon as well as on all edges of holes 8 so that the films of thetwo faces of the ribbon will be electrically interconnected through holes 8.
  • the metallic film is of a'thickness of a few microns.
  • Crosssection (d) of FIG. 4 shows atl@ the metallic deposit around the edge of a hole S.
  • the photographically printed product passes through a ⁇ development bath 2li, then through a fixing bath 22 and further through a washing bath 23.
  • the ribbon is then dried by passing through a drier apparatus (not shown) and is driven through an engraving bath 24.
  • the engraving bath removes the metallic deposit from the unimpressed parts; this operation isof short duration since the metallic deposit is very thin as stated above. ever the conducting bridges at the edges of the holes 8 are preserved asthese edges have been impressed previously together with the lines of the conductors of the drawings.
  • the engraved ribbon After emerging from the engraving bath, the engraved ribbon is carried through at least one galvanoplastic bath, FIG. 6. There is for instance a first galvanoplastic bath 26 wherein the metallic conductors receive a first copper deposit of a certain thickness; this first bath is alkaline. Then a second bath is provided at 27, of acid solution and high current intensity, wherein the previously increased deposit of copper is further increased in its thickness.
  • a first galvanoplastic bath 26 wherein the metallic conductors receive a first copper deposit of a certain thickness; this first bath is alkaline.
  • a second bath is provided at 27, of acid solution and high current intensity, wherein the previously increased deposit of copper is further increased in its thickness.
  • the thickness of the conductors previously printed upon the insulating ribbon is increased to the thickness, e.g. a few hundreds of a millimeter, required for deflecting windings.
  • the finished ribbon is dried at 29 and then wound around a mandrel of the required diameter resulting in a coiled product according to the Howv between or under insulation-bearing heated-rolls or a coating apparatus. This is done before the ribbon is picked up by the mandrel. Alternatively, simultaneously together with winding the printed ribbon, at least one insulating ribbon is wound around the mandrel.
  • An insulating film may' be deposited upon the ribbon emerging from drier 29, by passing this ribbon obtained and engraving said metallic film in accordance with said reproduction.
  • stepof optical projection is carried out through a Step-by-step drive of the metallized ribbon, projecting optical images on both sides of said ribbon shifted with respect to each other; said optical images at each step of the ribbon being gradually varied in size so that for each lamination of the coil their width varies in proportion to the change in diameter of 'said lamination with respect to the next preceding lamination and their length also varies in proportion to the change of length between said laminations divided by the number of they intervals between consecutive perforations provided within a single lamination of the coil; and placing insulation between the Vlaminations of said coil.
  • step of perforating is carried out by winding said insulating ribbon together with at least one spacer ribbon around a mandrel having a diameter equal to the ⁇ diameter of the nal coil and by punching perforations through said ribbon by means of frustoconical punches after which the perforated ribbons are unwound and the conductors are printed upon the insulating ribbons.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US480099A 1954-01-15 1955-01-06 Method of manufacturing printed electrical windings Expired - Lifetime US3011247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1002090X 1954-01-15

Publications (1)

Publication Number Publication Date
US3011247A true US3011247A (en) 1961-12-05

Family

ID=9561827

Family Applications (1)

Application Number Title Priority Date Filing Date
US480099A Expired - Lifetime US3011247A (en) 1954-01-15 1955-01-06 Method of manufacturing printed electrical windings

Country Status (5)

Country Link
US (1) US3011247A (fr)
BE (1) BE534603A (fr)
DE (1) DE1002090B (fr)
FR (1) FR1098226A (fr)
GB (1) GB795469A (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139566A (en) * 1955-08-25 1964-06-30 Hazeltine Research Inc Construction of magnetic deflection yokes and the like
US3218615A (en) * 1961-08-17 1965-11-16 Automatic Elect Lab Magnetic memory system and solenoid therefor
US3234631A (en) * 1960-06-15 1966-02-15 Hazeltine Research Inc Methods of manufacturing magnetic deflection coils and yokes
US3234629A (en) * 1962-06-14 1966-02-15 Defiance Printed Circuit Corp Method for producing printed circuits
US3240642A (en) * 1960-01-18 1966-03-15 Zenith Radio Corp Method of printing an electrical component
US3256586A (en) * 1961-08-28 1966-06-21 U S Engineering Co Inc Welded circuit board technique
US3283147A (en) * 1962-05-09 1966-11-01 Emik A Avakian Energy-projecting and scanning apparatus
US3290758A (en) * 1963-08-07 1966-12-13 Hybrid solid state device
US3332144A (en) * 1962-05-04 1967-07-25 United Aircraft Corp Method for making a readily assembled resolver having multiple pole pairs
US3454911A (en) * 1966-12-19 1969-07-08 Michel M Rouzier Reed relay matrices of crosspoints
US3466580A (en) * 1965-07-30 1969-09-09 Emi Ltd Circuit elements especially for use as scanning coils
US3484731A (en) * 1967-10-05 1969-12-16 Edward L Rich Printed circuit inductor
US3702450A (en) * 1971-05-11 1972-11-07 Atomic Energy Commission Printed circuit steering coils
US3769698A (en) * 1972-03-31 1973-11-06 Bendix Corp Method of manufacturing a photoetched induction coil
US4590426A (en) * 1983-12-08 1986-05-20 Sperry Corporation Bzz and Byz sense loop geometries for cylindrical tensor gradiometer loop structures
US4918418A (en) * 1988-08-04 1990-04-17 Caterpillar Inc. Inductive coil structure with electrical return path
US20090079277A1 (en) * 2005-05-27 2009-03-26 Namiki Seimitsu Houseki Kabushiki Kaisha Cylindrical coil and cylindrical micromotor using the same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149454B (de) * 1959-04-30 1963-05-30 Normacem S A Verfahren zur Herstellung der elektrisch leitenden Verbindungen zwischen aus flachen, lamellenartigen Leitern bestehenden Metallschichten, die auf beiden Seiten eines isolierenden kreisringfoermigen Traegers angebracht sind
US3736543A (en) * 1972-03-31 1973-05-29 Bendix Corp Photoetched induction coil assembly
DE3247585A1 (de) * 1982-12-22 1984-06-28 Siemens AG, 1000 Berlin und 8000 München Mehrkanalige vorrichtung zur messung von verschiedenen feldquellen hervorgerufener schwacher magnetfelder
NZ207264A (en) * 1984-02-23 1988-10-28 New Zealand Dev Finance Flexible printed circuit coil
CA2073266A1 (fr) * 1991-07-09 1993-01-10 Mehmet Rona Systeme de ciblage distal
EP0865655B1 (fr) * 1995-12-05 2001-04-04 Smith's Industries Aerospace & Defense Systems, Inc. Ensemble a bobines electromagnetiques a conducteurs souples

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647474A (en) * 1923-10-25 1927-11-01 Frederick W Seymour Variable pathway
US1940175A (en) * 1932-05-13 1933-12-19 Cfcmug Method and device for winding a filiform member within a hollow body
US1994534A (en) * 1932-04-23 1935-03-19 Rca Corp Inductance coil and method of manufacture thereof
US2014524A (en) * 1933-04-28 1935-09-17 Western Electric Co Article
US2334584A (en) * 1942-05-19 1943-11-16 Gen Electric Method of making electric coils
US2334671A (en) * 1942-02-06 1943-11-16 Baldwin Locomotive Works Machine for making electrical strain gauges
US2470045A (en) * 1945-11-07 1949-05-10 John J Nagy Condenser construction
US2502291A (en) * 1946-02-27 1950-03-28 Lawrence H Taylor Method for establishing electrical connections in electrical apparatus
US2616994A (en) * 1948-05-06 1952-11-04 Ibm Rotary switch
US2666254A (en) * 1949-10-04 1954-01-19 Hermoplast Ltd Method of manufacturing electrical windings
US2703854A (en) * 1943-02-02 1955-03-08 Hermoplast Ltd Electrical coil
US2745170A (en) * 1950-06-30 1956-05-15 Chrysler Corp Process for manufacturing electrical coils
US2769119A (en) * 1951-02-28 1956-10-30 Standard Coil Prod Co Inc Printed circuits

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE906831C (de) * 1951-12-11 1954-03-18 Rudolf Sliwka Vereinfachte Herstellung von Induktionsspulen, Drosseln und Transformatoren

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647474A (en) * 1923-10-25 1927-11-01 Frederick W Seymour Variable pathway
US1994534A (en) * 1932-04-23 1935-03-19 Rca Corp Inductance coil and method of manufacture thereof
US1940175A (en) * 1932-05-13 1933-12-19 Cfcmug Method and device for winding a filiform member within a hollow body
US2014524A (en) * 1933-04-28 1935-09-17 Western Electric Co Article
US2334671A (en) * 1942-02-06 1943-11-16 Baldwin Locomotive Works Machine for making electrical strain gauges
US2334584A (en) * 1942-05-19 1943-11-16 Gen Electric Method of making electric coils
US2703854A (en) * 1943-02-02 1955-03-08 Hermoplast Ltd Electrical coil
US2470045A (en) * 1945-11-07 1949-05-10 John J Nagy Condenser construction
US2502291A (en) * 1946-02-27 1950-03-28 Lawrence H Taylor Method for establishing electrical connections in electrical apparatus
US2616994A (en) * 1948-05-06 1952-11-04 Ibm Rotary switch
US2666254A (en) * 1949-10-04 1954-01-19 Hermoplast Ltd Method of manufacturing electrical windings
US2745170A (en) * 1950-06-30 1956-05-15 Chrysler Corp Process for manufacturing electrical coils
US2769119A (en) * 1951-02-28 1956-10-30 Standard Coil Prod Co Inc Printed circuits

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139566A (en) * 1955-08-25 1964-06-30 Hazeltine Research Inc Construction of magnetic deflection yokes and the like
US3240642A (en) * 1960-01-18 1966-03-15 Zenith Radio Corp Method of printing an electrical component
US3234631A (en) * 1960-06-15 1966-02-15 Hazeltine Research Inc Methods of manufacturing magnetic deflection coils and yokes
US3218615A (en) * 1961-08-17 1965-11-16 Automatic Elect Lab Magnetic memory system and solenoid therefor
US3256586A (en) * 1961-08-28 1966-06-21 U S Engineering Co Inc Welded circuit board technique
US3332144A (en) * 1962-05-04 1967-07-25 United Aircraft Corp Method for making a readily assembled resolver having multiple pole pairs
US3283147A (en) * 1962-05-09 1966-11-01 Emik A Avakian Energy-projecting and scanning apparatus
US3234629A (en) * 1962-06-14 1966-02-15 Defiance Printed Circuit Corp Method for producing printed circuits
US3290758A (en) * 1963-08-07 1966-12-13 Hybrid solid state device
US3466580A (en) * 1965-07-30 1969-09-09 Emi Ltd Circuit elements especially for use as scanning coils
US3454911A (en) * 1966-12-19 1969-07-08 Michel M Rouzier Reed relay matrices of crosspoints
US3484731A (en) * 1967-10-05 1969-12-16 Edward L Rich Printed circuit inductor
US3702450A (en) * 1971-05-11 1972-11-07 Atomic Energy Commission Printed circuit steering coils
US3769698A (en) * 1972-03-31 1973-11-06 Bendix Corp Method of manufacturing a photoetched induction coil
US4590426A (en) * 1983-12-08 1986-05-20 Sperry Corporation Bzz and Byz sense loop geometries for cylindrical tensor gradiometer loop structures
US4918418A (en) * 1988-08-04 1990-04-17 Caterpillar Inc. Inductive coil structure with electrical return path
US20090079277A1 (en) * 2005-05-27 2009-03-26 Namiki Seimitsu Houseki Kabushiki Kaisha Cylindrical coil and cylindrical micromotor using the same
US7986063B2 (en) * 2005-05-27 2011-07-26 Namiki Seimitsu Houseki Kabushiki Kaisha Cylindrical coil and cylindrical micromotor using the same

Also Published As

Publication number Publication date
FR1098226A (fr) 1955-07-20
BE534603A (fr) 1900-01-01
GB795469A (en) 1958-05-21
DE1002090B (de) 1957-02-07

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