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DE1062310B - Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber - Google Patents

Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber

Info

Publication number
DE1062310B
DE1062310B DEL30521A DEL0030521A DE1062310B DE 1062310 B DE1062310 B DE 1062310B DE L30521 A DEL30521 A DE L30521A DE L0030521 A DEL0030521 A DE L0030521A DE 1062310 B DE1062310 B DE 1062310B
Authority
DE
Germany
Prior art keywords
resin
parts
casting
epoxy
extinguishing
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
DEL30521A
Other languages
German (de)
Inventor
Dr-Ing Paul Nowak
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 DENDAT1065914D priority Critical patent/DE1065914B/de
Priority to NL239689D priority patent/NL239689A/xx
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DEL30521A priority patent/DE1062310B/en
Priority to FR796140A priority patent/FR1226125A/en
Priority to CH7390059A priority patent/CH423926A/en
Priority to GB1880059A priority patent/GB903961A/en
Publication of DE1062310B publication Critical patent/DE1062310B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
    • C08G59/22—Di-epoxy compounds
    • C08G59/26—Di-epoxy compounds heterocyclic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
    • C08G59/32—Epoxy compounds containing three or more epoxy groups
    • C08G59/3236—Heterocylic compounds
    • C08G59/3245—Heterocylic compounds containing only nitrogen as a heteroatom
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
    • C08G59/32—Epoxy compounds containing three or more epoxy groups
    • C08G59/38—Epoxy compounds containing three or more epoxy groups together with di-epoxy compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Insulating Materials (AREA)
  • Epoxy Resins (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

DEUTSCHESGERMAN

Die Erfindung bezieht sich auf Stromunterbrecher, insbesondere Hochspannungsschalter, mit Gießharzisolierteilen, wie Gießharzlöschkammern.The invention relates to circuit breakers, in particular high-voltage switches, with cast resin insulating parts, like cast resin extinguishing chambers.

Es ist bekannt, als Aufbaustoffe für Isolierbauteile von Schaltern oder ähnlichen Stromunterbrechern z. B. zur Herstellung von Löschkammern Gießharze zu verwenden. It is known as building materials for insulating components of switches or similar circuit breakers z. B. to use casting resins for the production of extinguishing chambers.

Die an sich bekannten und auf dem Markt erhältlichen Phenolepoxydgießharze finden für diesen Zweck Verwendung. Sie haben jedoch den Nachteil, daß sie unter Lichtbogeneinwirkung Spaltprodukte bilden, welche eine Verschlechterung der' Oberflächeneigenschaften dieser Gießharzisolierteile herbeiführen. Als insbesondere" nachteilig hat sich herausgestellt, daß ^ Gießharzisolierteile aus den bekannten Phenolepoxydharzen, wenn sie z. B. als Schaltkammerwände dienen, durch ihre Zersetzungsprodukte Anlaß zu Rückzündungen geben, so daß die Betriebstüchtigkeit solcher Stromunterbrecher dadurch sehr beeinträchtigt, wenn nicht in Frage gestellt wird.The phenol epoxy casting resins which are known per se and are available on the market are used for this purpose Use. However, they have the disadvantage that they form fission products under the action of an arc, which lead to a deterioration in the surface properties of these cast resin insulating parts. as in particular "it has been found disadvantageous that ^ cast resin insulating parts made of the known phenol epoxy resins, if you z. B. serve as switching chamber walls, due to their decomposition products give rise to reignitions give, so that the serviceability of such circuit breakers is greatly impaired when is not questioned.

Man hat schon versucht, nach Art der bekannten Hartgasschalter solche dem Lichtbogen ausgesetzten Isolierteile aus Gießharz entweder mit einer Schicht zu überziehen, welche unter der Einwirkung des Lichtbogens Löschgase erzeugt, oder aber dem Gießharz an sich bekannte, Löschgas bildende Füllmittel zuzusetzen. Dieser Ausweg führt zu einem mehr oder weniger guten Erfolg. Das Einsetzen bzw. Aufbringen von Löschgas abgebenden Schichten ist aber fertigungstechnisch nicht zufriedenstellend, und Zusätze zum Harz können außerdem die mechanischen Eigenschaften dieser Gießharzisolierteile nachteilig beeinflussen. Bei der üblichen mechanischen Verstärkung des Harzes mit Füllstoffen, wie anorganischen Pigmenten oder Faserstoffen, tritt die Gefahr auf, daß unzureichende Löschgasmengen abgegeben werden.Attempts have already been made to expose such switches to the arc in the manner of the known hard gas switches Insulating parts made of cast resin either have to be covered with a layer that is exposed to the action of the electric arc Generating extinguishing gases, or adding extinguishing gas-forming fillers known per se to the casting resin. This way out leads to a more or less good success. The insertion or application of layers emitting extinguishing gas is, however, unsatisfactory from a manufacturing point of view, and additives to the resin can also adversely affect the mechanical properties of these cast resin insulating parts. With the usual mechanical reinforcement of the resin with fillers, such as inorganic Pigments or fibers, there is a risk that insufficient amounts of extinguishing gas will be given off.

Die Erfindung beschreitet deshalb einen neuen Weg, um diese Nachteile zu vermeiden.The invention therefore takes a new approach to avoid these disadvantages.

Gegenstand der Erfindung ist ein Stromnunterbrecher, insbesondere Hochspannungsschalter, mit Gießharzisolierteilen, vorzugsweise mit einer Löschkammer aus Gießharz, bei dem die einer Lichtbogeneinwirkung ausgesetzten Teile mindestens zum Teil aus einem Epoxydgießharz bestehen, welcher dadurch gekennzeichnet ist, daß das Epoxydharz durch Einbau von Epoxydgruppen in Triazinverbindungen oder deren Derivate hergestellt und mit einem geeigneten Härter, z. B. sauren oder alkalisch reagierenden Härtern oder Metallalkoholaten ausgehärtet worden ist.The invention relates to a circuit breaker, in particular a high-voltage switch, with Cast resin insulating parts, preferably with an extinguishing chamber made of cast resin, in which the effect of an arc exposed parts at least partly consist of an epoxy casting resin, which thereby is characterized in that the epoxy resin by incorporation of epoxy groups in triazine compounds or their derivatives are prepared and treated with a suitable hardener, e.g. B. acidic or alkaline reacting Hardeners or metal alcoholates has been cured.

Durh Verwendung der Gießharze nach der Erfindung für den genannten Zweck wird überraschenderweise ein Isolierteil erhalten, welches unter Lichtbogeneinwirkuhg keine Spaltprodukte hinterläßt, Stromunterbrecher
mit Löschgas erzeugenden Isolierteilen,
insbesondere mit GießharzlöschkammerBy using the casting resins according to the invention for the purpose mentioned, an insulating part is surprisingly obtained which does not leave any fission products under the action of an arc, a circuit breaker
with insulating parts that generate extinguishing gas,
especially with cast resin extinguishing chamber

Anmelder:Applicant:

LICENTIA Patent-yerwaltungs-G.m.b.H., Hamburg 36, Hohe Bleichen 22LICENTIA Patent-yerwaltungs-G.m.b.H., Hamburg 36, Hohe Bleichen 22

Dr.-Ing. Paul Nowak, Kassel, ist als Erfinder genannt wordenDr.-Ing. Paul Nowak, Kassel, has been named as the inventor

welche zu Rückzündungen des Bogens führen oder die Oberfläche des Isolierteils nachteilig beeinflussen. Ihre Löschwirkung ist gegenüber bekannten anderen Isolierteilen mit Löschgas abgebenden Verbindungen mindestens ebenso gut; darüber hinaus wirken sich vorteilhaft die guten mechanischen und thermischenwhich lead to reignition of the arc or adversely affect the surface of the insulating part. Her Compared to known other insulating parts, the extinguishing effect is with compounds that emit extinguishing gas at least as good; in addition, the good mechanical and thermal properties have a beneficial effect

Eigenschaften dieser Gießharzisolierteile für eine Hochspannungsisolation aus. Hinzu kommen die günstigen Verarbeitungseigenschaften, da diese Harze niedrigviskos und als Gießharz auch bei niedrigen Temperaturen ausgehärtet werden können.Properties of these cast resin insulating parts for high-voltage insulation. Then there are the cheap ones Processing properties, as these resins have a low viscosity and, as a casting resin, also with low viscosity Temperatures can be cured.

Die Gießharzisolierteile nach der Erfindung bestehen mindestens zum Teil aus einem gehärteten Gießharz, welches ein 2,4,6-Triglyzidoxy-l,3,5-Triazin enthält. Der heterozyklische Ring im Epoxydharz bildet offenbar unter der Lichtbogeneinwirkung Spaltprodukte, welche eine gute Löschgaswirkung haben; dabei wirkt sich noch vorteilhaft aus, daß diese Zersetzungsprodukte nicht aggressiv auf die Metallteile der elektrischen Apparate wirken.The cast resin insulating parts according to the invention consist at least partially of a hardened cast resin, which contains a 2,4,6-triglycidoxy-1,3,5-triazine. The heterocyclic ring in the epoxy is apparently forming fission products under the effect of the arc, which have a good extinguishing gas effect; acts thereby It is also advantageous that these decomposition products do not have an aggressive effect on the metal parts of the electrical Apparatus work.

Für die Erfindung können auch Gießharze Verwendung finden, bei denen sich die Epoxydharzbasis vom Melamin ableitet, so daß die Seitengruppen noch zusätzlich Stickstoff enthalten.For the invention, casting resins can also be used in which the epoxy resin base is from Melamine derives, so that the side groups also contain nitrogen.

Die Gas abgebenden Gießharze nach der Erfindung eignen sich insbesondere für die Herstellung von Flachkammerschaltern, bei welchen die Schaltstrecke sich in einem schlitzförmigen Teil der Löschkammer befindet und bei welchen besonders hohe Anforderungen an die ein Löschgas abgebenden Kammerwände gestellt werden.The gas-emitting casting resins according to the invention are particularly suitable for the production of Flat-chamber switches, in which the switching path is in a slot-shaped part of the arcing chamber and where there are particularly high demands on the chamber walls emitting an extinguishing gas be asked.

909 579/315909 579/315

Claims (2)

Ein solcher Hochspannungsschalter ist in der deutschen Patentanmeldung L 29900 VIIIb/21 c beschrieben worden, und Versuche mit dem nach der Erfindung verwendeten Gießharz als Löschkammerisolierteil ergaben eine überraschend gute Löschwirkung der erfindungsgemäßen Harze, ohne daß eine Rückzündung des Bogens erfolgte, wie sie zum Teil mit anderen Gießharzen auf Phenolepoxydharzbasis im gefüllten oder ungefüllten Zustand auftraten. Auf Grund welcher Vorgänge die überraschend gute Lösch wirkung des Harzes beruht und weshalb insbesondere mit den Gießharzen nach der Erfindung eine Rückzündung des Lichtbogens vermieden werden kann, ist noch nicht völlig geklärt. In den Fällen, wo die Anforderung an die Löschgasmenge nicht allzu hoch zu stellen sind, können geeignete Kombinationen aus dem Gießharz nach der Erfindung mit anderen Epoxydgießharzen, z. B. auf Phenolepoxydharzbasis oder Anilinbasis, Anwendung finden, um den Anforderungen der Isolierteile in mechanischer, thermischer und elektrischer Hinsicht zu genügen. Selbstverständlich können auch gefüllte Gießharze, d. h. mit Quarzmehl oder mit Glasfasern verstärkte Gießharzisolierkörper in an sich bekannter Weisen mit den Harzen nach der Erfindung hergestellt werden. Beispiel 1 Als geeignete Gießharzkomponente nach der Erfindung hat sich ein Triazinepoxydharz mit drei Epoxygruppen pro Molekül erwiesen, das auf 100 Teile Harz 100 Teile Maleinsäureanhydrid als Härter und 100 Teile Quarzmehl enthielt. Beispiel 2 Ebenfalls günstige Eigenschaften für die Löschwir kung zeigt folgende Harzmischung: 100 Teile eines Triazinepoxydharzes mit zwei Epoxygruppen pro Molekül, 70 Teile Maleinsäureanhydrid, 50 Teile Porzellanmehl, 100 Teile Glasfasern. Diese Harzmischung ergibt neben der guten Löschwirkung ein Isolierteil mit günstigen mechanischen Eigenschaften. Patentansprüche:Such a high-voltage switch has been described in the German patent application L 29900 VIIIb / 21c, and tests with the casting resin used according to the invention as the quenching chamber insulating part resulted in a surprisingly good extinguishing effect of the resins according to the invention without reignition of the arc, as was sometimes the case with other casting resins based on phenol epoxy resin occurred in the filled or unfilled state. The reasons for the surprisingly good extinguishing effect of the resin and why reignition of the arc can be avoided, in particular with the casting resins according to the invention, has not yet been fully clarified. In cases where the requirements for the amount of extinguishing gas are not too high, suitable combinations of the casting resin according to the invention with other epoxy casting resins, e.g. B. based on phenol epoxy resin or aniline, are used to meet the requirements of the insulating parts in mechanical, thermal and electrical terms. Of course, filled casting resins, i. H. Cast resin insulating bodies reinforced with quartz powder or with glass fibers can be produced in a manner known per se with the resins according to the invention. EXAMPLE 1 A triazine epoxy resin with three epoxy groups per molecule and containing 100 parts of maleic anhydride as hardener and 100 parts of powdered quartz per 100 parts of resin has proven to be a suitable casting resin component according to the invention. EXAMPLE 2 The following resin mixture also shows favorable properties for the extinguishing effect: 100 parts of a triazine epoxy resin with two epoxy groups per molecule, 70 parts of maleic anhydride, 50 parts of porcelain flour, 100 parts of glass fibers. In addition to the good extinguishing effect, this resin mixture results in an insulating part with favorable mechanical properties. Patent claims: 1. Stromunterbrecher, insbesondere Hochspannungsschalter, mit Gießharzisolierteilen, vorzugsweise mit einer Löschkammer aus Gießharz, bei welchem die einer Lichtbogeneinwirkung ausgesetzten Isolierteile mindestens zum Teil aus einem Epoxydgießharz bestehen, dadurch gekennzeichnet, daß das Epoxydharz durch Einbau von Epoxydgruppen in Triazinverbindungen oder deren Derivate hergestellt und mit einem geeigneten Härter, insbesondere sauren oder alkalisch reagierenden Härtern oder Metallalkoholate^ ausgehärtet worden ist.1. Circuit breakers, especially high-voltage switches, with cast resin insulating parts, preferably with an extinguishing chamber made of cast resin, in which the exposed to an arc effect Insulating parts consist at least in part of an epoxy casting resin, characterized in that that the epoxy resin by incorporation of epoxy groups in triazine compounds or their Derivatives prepared and with a suitable hardener, especially acidic or alkaline reacting Hardeners or metal alcoholates ^ has been cured. 2. Stromunterbrecher nach Anspruch 1, dadurch gekennzeichnet, daß das gehärtete Gießharz ein 2,4,6-Triglyzidoxy-l,3,5-Triazin enthält.2. Circuit breaker according to claim 1, characterized in that the hardened casting resin is a Contains 2,4,6-triglycidoxy-1,3,5-triazine. In Betracht gezogene Druckschriften:
Deutsche Auslegeschrift Nr. 1 002 058.Considered publications:
German interpretation document No. 1 002 058. © 909 579/315 7.59© 909 579/315 7.59
DEL30521A 1958-06-02 1958-06-02 Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber Pending DE1062310B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DENDAT1065914D DE1065914B (en) 1958-06-02
NL239689D NL239689A (en) 1958-06-02
DEL30521A DE1062310B (en) 1958-06-02 1958-06-02 Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber
FR796140A FR1226125A (en) 1958-06-02 1959-05-30 Switch with insulating parts generating extinguishing gas, in particular with cast resin extinguishing chamber
CH7390059A CH423926A (en) 1958-06-02 1959-06-01 Circuit breakers, in particular high-voltage switches, with cast resin insulating parts
GB1880059A GB903961A (en) 1958-06-02 1959-06-02 A circuit breaker having resinous insulating members

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEL30521A DE1062310B (en) 1958-06-02 1958-06-02 Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber
DEL0031810 1958-11-26

Publications (1)

Publication Number Publication Date
DE1062310B true DE1062310B (en) 1959-07-30

Family

ID=25985170

Family Applications (2)

Application Number Title Priority Date Filing Date
DENDAT1065914D Pending DE1065914B (en) 1958-06-02
DEL30521A Pending DE1062310B (en) 1958-06-02 1958-06-02 Circuit breaker with insulating parts that generate extinguishing gas, in particular with cast resin extinguishing chamber

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DENDAT1065914D Pending DE1065914B (en) 1958-06-02

Country Status (5)

Country Link
CH (1) CH423926A (en)
DE (2) DE1062310B (en)
FR (1) FR1226125A (en)
GB (1) GB903961A (en)
NL (1) NL239689A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1209182B (en) * 1960-08-30 1966-01-20 Licentia Gmbh Insulation wall for electrical apparatus or devices made of a multi-layer material, exposed to brief pressure waves
DE2538400A1 (en) * 1974-12-20 1976-06-24 Sprecher & Schuh Ag ELECTRICAL EQUIPMENT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761660A (en) * 1970-07-30 1973-09-25 Rostone Corp Arc interrupting composition and apparatus
US4104238A (en) * 1976-11-23 1978-08-01 Westinghouse Electric Corp. Silica-alumina trihydrate filled epoxy castings resistant to arced SF6

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002058B (en) * 1954-08-11 1957-02-07 Licentia Gmbh Insulating body for switching chambers of high-voltage switches

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002058B (en) * 1954-08-11 1957-02-07 Licentia Gmbh Insulating body for switching chambers of high-voltage switches

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1209182B (en) * 1960-08-30 1966-01-20 Licentia Gmbh Insulation wall for electrical apparatus or devices made of a multi-layer material, exposed to brief pressure waves
DE2538400A1 (en) * 1974-12-20 1976-06-24 Sprecher & Schuh Ag ELECTRICAL EQUIPMENT

Also Published As

Publication number Publication date
FR1226125A (en) 1960-07-08
NL239689A (en)
GB903961A (en) 1962-08-22
CH423926A (en) 1966-11-15
DE1065914B (en) 1959-09-24

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