US3737995A - Method for the production of plastic - Google Patents

Method for the production of plastic Download PDF

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Publication number
US3737995A
US3737995A US00200124A US3737995DA US3737995A US 3737995 A US3737995 A US 3737995A US 00200124 A US00200124 A US 00200124A US 3737995D A US3737995D A US 3737995DA US 3737995 A US3737995 A US 3737995A
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US
United States
Prior art keywords
coil
core
wire
transporting belt
belt
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
US00200124A
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English (en)
Inventor
F Utner
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.)
Siemens AG
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Siemens AG
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
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Publication of US3737995A publication Critical patent/US3737995A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/02—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using magnetic or inductive elements
    • 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
    • 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
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling

Definitions

  • ABSTRACT Plastic covered coils which are compact and easily inserted in a circuit board are efficiently and economically produced by a continuous production method wherein a generally tubular core having a winding thereon is plugged onto a mounting rod portion of a transporting belt and has the coils ends connected to a upper portion of the belt, a coating of plastic is applied over the coil sub-assembly, the upper discontinuous portion of the band is separated from the lower continuous portion, and the contacts formed as required.
  • An enlarged base formed by the plastic coating may contain coil control components.
  • This invention generally relates to a method for the substantiallycontinuous production of generally cylindrically shaped plastic covered coils having a pluggedtype electrical connection useful in circuit boards where they are plugged inon one end and upstand vertically. More specifically the coils have a tubular core through which one of the winding wires is run and into which an upstanding mounting rod is inserted so that continuous production is facilitated.
  • a coating of plastic insulating material may be of varying thickness along the length of the coil to provide portions thereof with different diameters in accordance with application requirements.
  • a small semi-conductor plate is set onto a corresponding surface of a small carrier plate and attached thereto by gluing or welding their contacts onto other strips which are provided,for this purpose.
  • Another disadvantage is that one of the laterally projecting solder contacts must be slipped over the coil and guided toward the printed circuit thereby requiring that a relatively large distance be provided between the winding which has been placed around the component part and the core after the structure has been coated to become a cylindrical component part. Furthermore, the magnetic coupling between the outer winding and that one which is applied to the core would be very bad with this construction since it would cause a strong influencing of adjacent coils. In addition, providing for connections on both sides of a coil member as illustrated herein it is very difficult according to the prior art and requires complicated embossments and'metal working. This is especially true if only one transporting belt means is to be used for the production of both contacts.
  • this advantageous method comprises the steps of winding an elongated tubular core with an outer wire winding of at least one wire, positioning one end of the wire winding so that it extends through tubular core whereby the first and second ends of the wire winding are at a first end of the tubular core, mounting this tubular wire wound core on a projecting portion of a transporting belt means, said belt means having an outer portion which,
  • first and second contact means when separated therefrom, may serve as first and second contact means, connecting the first and second wire ends to separate ones of the contact means, applying a coating generally over the surface of the coil accept for portions of the contact means, and separating the outer portion of the transporting belt means to form the coil means.
  • This method has the advantage of avoiding mechanical stress on the coil during the electrically conductive connecting with the contact surfaces, during the coating of the coil, and during the later insertion into the electrical circuit.
  • Another advantage is that the coils are held by the projecting portion or mounting rod projection without a necessity for enlarging the core elements circumference at various places as was true in the prior art.
  • the rectangular cross section of the mounting rod projection results in the advantage that while on the one hand, it can be adapted exactly to the tubular core diameter, it does on the other hand, leave sufficient space to allow threading one end of the wire winding through the core.
  • the coil is generally cylindrically shaped with a first end of the coil including an enlarged base portion having first and second laterial projections which projections are of a different width are of a width less than a diameter of the cylindrical portion.
  • the first and second projections are each adjacent a contact means.
  • the lateral projection forms a pedestal which may have embedded therein during the coating step one or more component control elements.
  • a further feature which is economically incorporated in the coil construction and which avoids adjusting devices when the completed coil is, inserted into the circuit board includeS a stop which is formed by the free part of the contact surface being preferably bent at a right angle to the remainder of the contact surface.
  • a transporting belt means contains a plurality of spaced mounting rod projections extending from one edge of a strip-like member.
  • the mounting rod projection may be of a rectangular cross section taken transverse to the axis thereof.
  • a slit is provided adjacent the mounting rod projection and extends inwardly from the edge whereby when the transporting belt means 'iscut along a line inwardly and roughly parallel to the edge the mounting rod projections will be separated from the transporting belt means and the portions of the transporting belt means adjacent the slits will serve as contact surfaces. At least one opening may be cut into the contact surfaces in order to obtain a better mechanical connection between the coating and the contact surfaces.
  • the corresponding end of the coil wire may be welded to the projecting pieces of the rod to guarantee a particularly good electrical connection.
  • the contact surfaces will be separated from each other and the coils may be separated from the transporting belt by means of only one cut.
  • the contacts or contact surfaces are held in the plastic coated base or pedestal in a stable relationship due to the openings in the contact surfaces which the plastic coating will penetrate during the coating process.
  • the projecting portion of the transporting belt means may be provided with an internal longitudinally extending slit dividing the projecting portion into first and second parts, which parts are bent away from each other to provide a more stable connection and support for the core during the manufacturing process.
  • the transporting belt means may be designed to have a first and second separated portion whose distance of separation is adapted generally to the length of the .coils and the rod cores.
  • the second portion of the belt may have an inner edge with a plurality of spaced mounting rods projecting towards the second portion and the second portion may have an inner edge with a plurality of spaced mounting supports generally projecting toward the first portion.
  • the inner edge of the first portion may have indentations therein receiving an end of the coil core.
  • the first and second portions have slits extending inwardly from the inner edges adjacent each mounting rod projection and mounting support whereby when the first and second portions are cut along a line inwardly of and generally parallel to the inner edges it will result that the mounting rods and the mounting supports will be separated from the transporting belt means.
  • a transporting belt means of this design has the advantage of providing particularly good guidance of the coil and rod core because of their cenral balanced relationship to each other. It also allows a particularly good utilization of the belt material and allows the separation of the rod core as by means of a first cut along a separation line in the second portion and a simultaneous separation of the coils by a second cut along a separation line in the first portion.
  • the mounting rod projections and mounting supports may be attached in groups of particular sizes and may be arranged in predetermined groups in accordance with the number of coils or rod cores respectively required in a particular application. This greatly facilitates their packing and/or storage.
  • the mounting support for the rod core on the transporting belt second portion may take the form of a genj the T-shaped member.
  • An adequate support for the rod core is provided by bending the cross member of the T-shaped member into a generally circular shape portion and bending the leg at right angles to its initial position whereby the leg serves as a stop for the unwound core when it is inserted into the circular shape portion.
  • FIG. 1 is an elevational view of the coil sub-assembly about to be attached to a transporting belt means wherein the coil is shown in cross section to illustrate how the'connection wire is guided through the opening of the central core member;
  • FIG. 2 is an elevational veiw of the belt having a coil, shown in cross section, which has been produced accordingto the method of the invention before the excess portion of the transporting belt means has been separated;
  • FIG. 3 is a top view of a completed coil assembly illustrating an exaggerated base construction having lateral projections of different sizes with control elements embedded therein;
  • FIGS. 4 and 5 illustrate a further embodiment of the mounting rod projection of the transporting belt having an internal slit dividing the projecting portion into first and second parts which are bent away from each other;
  • FIG. 6 illustrates another embodiment of a transporting belt means according to the invention wherein a recess on a first portion holds a first end of the core and a mounting rod extension on a second portion of the transporting belt holds a second end of the core;
  • FIG. 7 is a top view of just the mounting support of FIG. 6.
  • FIG. 1 there may be seen a generally elongated coil means generally indicated at 35 which includes a tubular core 1 surrounded by at least a single layer winding 2 of a single piece of wire having a first end 3 and a second end 6. As shown, the first end 3 of the wire forming the coil 2 is threaded through the tubular core member 1 to provide for both ends of the wire at the first end la of the core 1. As may be seen from a comparison of FIGS. 1 and 2, the tubular core l is forced over a projecting rod means 4 which rod means is initially integral with a transporting belt means 5.
  • the transporting belt means 5 has indentations 36 and 37 adjacent the mounting rod projection 4 which indentations are generally of a width to receive the first end la of the core member 1.
  • a plurality of slits 7 extend'inwardly from an edge 5a of the transporting belt 5 a distance sufficient to extend below a separating cutting line-29.
  • the transporting belt means 5 includes contact surfaces 8 and 9 situated between the slits 7 which contact surfaces have connected thereto the second and first ends of the wire 6 and 3, respectively.
  • the second end 6 may be welded to the contact portion 8 and the first end of the coil wire may be welded to the contact portion 9.
  • Suitable holes 13 and 15 may be provided in the contact portions 9 and 8, respectively, and the wire ends 3 and 6 may be passed therethrough prior to welding to effect a superior electrical connection between the wires and the contacts 8 and 9.
  • the tubular core and a portion of the contact portions 8 and 9 are coated with a plastic electrically insulating material to form a covering generally indicated at 10.
  • the material may be sprayed on with or without a mold.
  • the coating 1 serves to provide a mechanical protection of the wind 7 ings, of the thin connection wires 3 and 6 (which may be in the order of 1/1 0 of a millimeter in diameter) and of their connection to the contact portions 8 and 9.
  • the upper cylindrical portion 11 of the coil has as small a diameter as possible necessary to meet production tolerances.
  • the first laterally extending portion of the base 27 may have a width a whereas the second portion 32 may have a width b so that when the coil is plugged by means of its first end and contacts into a mounting board the contacts will be properly oriented.
  • the lateral projections 27 and 32 may be enlarged to include embedded component coil control elements 40 and 41, respectively. These component control elements may be a resistor and/or a diode which, when embedded in the base during the process of making the coil, provide a lower interference sensitivity of the control and a more simple circuit arrangement.
  • the first wire end 3 may be welded at either of points 13 and 14 on the contact portion 9.
  • the point 13 has the advantage that it is on about the same latitude as the point on the contact portion 8 and thereby lends itself better to an automatic welding arrangement.
  • the point 14 is at the connection point of the mounting rod projection 4 and thereby guarantees a particularly small free wave length of the connection wire 3.
  • the wire 3 of course has been shielded by the core 1 throughout its length and this construction is particularly advantageous for thin wires.
  • the slits 7 in the band 5 extend below a separation cutting line 29 so that the contact portions 8 and 9 are separated from each other and from the remainder of the belt 5 with only one cut along the separation line 29.
  • the coating may extend into the slit 7 to provide a positive insulation between the portions 8 and 9.
  • the contact portions 8 and 9 each include therein a hole means 39 through which the coating 10 will extend to lock the contact portions 8 and 9 securely in place. Whereas the contact portion 9 will be securely held by the portion of the projecting rod 4 which will remain in place, the contact portion 8 will benefit from the provision of the hole 39.
  • contact means 16 and 17 may be provided in place of the contact portions 8 and 9 as shown in FIG. 1, there may be provided contact means 16 and 17 as shown in FIG. 3.
  • the contact surfaces 16 and 17 may be bent at a generally right angle either at the beginning of the method of making the coil or alternatively after the coil has been separated from a transporting rod 5.
  • the bent portions serve as a stop means to limit the distance which the coil may be inserted into the circuit board.
  • the projecting portion 19 of the transporting belt means may be provided with an internal slit 20 dividing the projecting portion 19 into a first part 21 and a second part 22 which parts 21 and 22 are bent away from each other to provide an enlargement of the projecting rod portion.
  • the core 1 When the core 1 is positioned on this projecting portion it may be seen that greater stability may be provided while at the same time allowing the wire 3 to be threaded through the tubular core.
  • a two sided transporting belt generally indicated at 23 in FIG. 6 which consists of first and second portions 33 and 34, respectively, that are spaced apart a distance generally equal to the length of a tubular core member 1 as schematically illustrated in dotted lines.
  • This construction is particularly useful where both wound coils 35 and unwound rod cores such as shown at 1 are needed in the circuit.
  • the first portion 33 of the transporting belt means has an innei' edge 33a with a plurality of indentations therein for receiving a first end la of the rod core 1.
  • slits 7 as shown with respect to the belt 5 may also be provided.
  • the second portion 34 has an inner edge 34a having a plurality of spaced mounting rods 24 positioned thereon to be received in a second end lb of a mounting rod 1.
  • the second portion 34 may have a mounting support means generally indicated at 26 also extending from its inner edge 34a and, as shown, spaced between the mounting rod projections 24.
  • the mounting support means 26 is also shown by itself in a top view in FIG. 7.
  • the mounting support member 26 for the unwound broad core takes the form of a generally T-shaped member consisting of a leg 31 extending from the second portion 34 and having a cross member 30 extending from the end thereof remote from the second portion 34.
  • the cross member I 30 may be seen in FIG. 7 to be bent in a generally circular configuration to receive the core member therein and the leg 31 is bent at right angles adjacent its opposite ends whereby the legs serves as a stop for an unwound core when the unwound core is inserted in the circular shaped portion 25.
  • the mounting rod projections 24 as well as the mounting support means 26 will be severed from the second portion of the transporting belt means 34 along a line generally indicated at 28 in FIG.
  • the portion 26a of the mounting support means 26 may serve as a base plug for insertion of the mounting rod core in a circuit board.
  • the mounting rod cores together with the mounting support 25 will be coated with a plastic coating in the same process as the adjacent coils so that the mounting support 25 will be permanently connected to the rod cores.
  • This two portioned transporting belt 7. means has the advantage of providing stable guidance of the coil and rod cores through the manufacturing process since it serves to secure opposite ends of the coils and cores.
  • the transporting belt 23 may have inner connecting portion 23a extending between the first and second portions of the belt at intervals therealong to assure stability and constant spacing.
  • the belt material may be of an electrical conducting copper of a gauge which supplies sufficient rigidity in accordance with the coil and core sizes. This material allows a particularly good utilization of the belt and provides for ease of separation of the projecting portions inside the cutting lines 28 and 29.
  • the steps in this method include winding a tubular core 1 with an outer wire winding of at least one wire 2, said wire 2 having a first end 3 and a second end 6, positioning or threading the first end 3 of the wire winding 2 so that it extends through the tubular core 1 whereby the first and second ends 3 and 6 of thewire are .at a first end la of the tubular core, mounting this tubular wire wound core 1 on a projecting portion of a transporting belt means either by positioning the core first end la over a mounting rod projection 4 or 19 as shown in FIGS. 1, 2 and 4 or mounting the second end lbof the rod 1 on the mounting rod projection 24 as shown in FIG.
  • the method further include the steps of providing the projecting portion 19 of the transporting belt means with an intemal slit 20 dividing the projecting portion 19 into a first and second portions 21, 22 and bending these portions away from each other.
  • a method for the substantially continuous production in wells'ofa generally elongated coil means having first and second ends, said first end including a base means having contact means thereon comprising the steps of winding onto a tubular core a plurality of turns of at least one wire, said wire having a first end and a second end, positioning one end of the wire winding so that it extends through the tubular core whereby said first and second ends of the wire winding are at said first end of said tubular core, mounting this tubular wire wound core on a projecting portion of a transporting belt means, said belt means having an outer portions which, when separated therefrom, serve as first and second contact means, connecting said first and second wire ends to separate ones of said contact means, applying a coating generally over the surface of said coil means except for portions of said contact means, and separating said outer portions of said transporting belt means from the remainder of said belt to form said coil means.
  • said transporting belt means comprises two generally parallel and spaced first and second portions, said second portion of said belt having a mounting rod projection received in said second end of said tubular core.
  • said belt secondportion has a generally T-shaped member consisting of a leg and a cross member extending therefrom, said T-shape member being attached to said second portion by the leg of said T-shaped member, said method including the steps of bending said cross member of said -T-shape member into a generally circular shaped portion, and bending said leg at right angles whereby said leg serves as a stop for said unwound core when said unwound core is inserted in said circular shaped portion.
  • said coil is generally cylindrically shaped, said first end of said coil including an enlarged base portion having first and second lateral projections, said projections being of a different width and being less than a diameter of said cylindrical portion, said first and second projections being adjacent each of said contact means.
  • said con tact means when separated from said belt means has a portion thereof bent at a right angle thereto whereby said bent portion may serve as a stop means when said coil is plugged in a circuit board.
  • a method according to claim 1 including providing said projecting portion of said transporting belt means with and internal slit dividing said projecting portion into a first and a second part, and bending said first and second parts away from each other.
  • a method according to claim 5 including the step of embedding component coil control elements in said lateral projections.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Insulated Conductors (AREA)
US00200124A 1970-11-19 1971-11-18 Method for the production of plastic Expired - Lifetime US3737995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2056909A DE2056909C3 (de) 1970-11-19 1970-11-19 Verfahren zur Herstellung von kunststoffumhüllten Spulen

Publications (1)

Publication Number Publication Date
US3737995A true US3737995A (en) 1973-06-12

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ID=5788565

Family Applications (1)

Application Number Title Priority Date Filing Date
US00200124A Expired - Lifetime US3737995A (en) 1970-11-19 1971-11-18 Method for the production of plastic

Country Status (10)

Country Link
US (1) US3737995A (ru)
BE (1) BE775566A (ru)
CH (1) CH544390A (ru)
DE (1) DE2056909C3 (ru)
ES (1) ES396499A1 (ru)
FR (1) FR2115222B1 (ru)
GB (1) GB1336208A (ru)
IT (1) IT940616B (ru)
NL (1) NL7113542A (ru)
SU (1) SU461519A3 (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973321A (en) * 1974-09-10 1976-08-10 The Anaconda Company Method of preparing circuit boards comprising inductors
EP0058901A2 (en) * 1981-02-25 1982-09-01 HONEYWELL BULL ITALIA S.p.A. Electromagnet assembly for mosaic printing head and related manufacturing method
US4879804A (en) * 1988-09-30 1989-11-14 Chiang C Y Method of fabricating a coil

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2617465C3 (de) * 1976-04-21 1978-10-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrische Spule und Verfahren zu ihrer Herstellung
FR2486704A1 (fr) * 1980-07-09 1982-01-15 Cit Alcatel Procede de fabrication d'une inductance miniature ajustable et inductance ainsi obtenue
CN112846751B (zh) * 2020-12-23 2023-03-24 深圳爱仕特科技有限公司 一种用于单晶硅片触头线圈骨架装配设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649558A (en) * 1949-06-09 1953-08-18 Western Electric Co Mounting head for coil terminals
US2722671A (en) * 1952-08-02 1955-11-01 Advance Transformer Co Terminal strip
GB950803A (en) * 1962-07-13 1964-02-26 Standard Telephones Cables Ltd Component mounting arrangement
US3590480A (en) * 1968-10-03 1971-07-06 Theodore H Johnson Jr Method of manufacturing a pulse transformer package
US3625350A (en) * 1970-08-12 1971-12-07 Jimmy C Ray Web and connectors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649558A (en) * 1949-06-09 1953-08-18 Western Electric Co Mounting head for coil terminals
US2722671A (en) * 1952-08-02 1955-11-01 Advance Transformer Co Terminal strip
GB950803A (en) * 1962-07-13 1964-02-26 Standard Telephones Cables Ltd Component mounting arrangement
US3590480A (en) * 1968-10-03 1971-07-06 Theodore H Johnson Jr Method of manufacturing a pulse transformer package
US3625350A (en) * 1970-08-12 1971-12-07 Jimmy C Ray Web and connectors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973321A (en) * 1974-09-10 1976-08-10 The Anaconda Company Method of preparing circuit boards comprising inductors
US4115840A (en) * 1974-09-10 1978-09-19 The Anaconda Company Printed circuit board with fluorocarbon coated inductor
EP0058901A2 (en) * 1981-02-25 1982-09-01 HONEYWELL BULL ITALIA S.p.A. Electromagnet assembly for mosaic printing head and related manufacturing method
EP0058901A3 (en) * 1981-02-25 1983-07-20 Honeywell Information Systems Italia S.P.A. Electromagnet assembly for mosaic printing head and related manufacturing method
US4879804A (en) * 1988-09-30 1989-11-14 Chiang C Y Method of fabricating a coil

Also Published As

Publication number Publication date
FR2115222B1 (ru) 1975-08-29
BE775566A (fr) 1972-03-16
DE2056909B2 (de) 1975-01-23
DE2056909C3 (de) 1975-08-28
DE2056909A1 (de) 1972-05-31
ES396499A1 (es) 1974-05-01
SU461519A3 (ru) 1975-02-25
IT940616B (it) 1973-02-20
GB1336208A (en) 1973-11-07
FR2115222A1 (ru) 1972-07-07
NL7113542A (ru) 1972-05-24
CH544390A (de) 1973-11-15

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