DE850312C - Compressed gas switch with multiple interruption - Google Patents
Compressed gas switch with multiple interruptionInfo
- Publication number
- DE850312C DE850312C DEA1345A DEA0001345A DE850312C DE 850312 C DE850312 C DE 850312C DE A1345 A DEA1345 A DE A1345A DE A0001345 A DEA0001345 A DE A0001345A DE 850312 C DE850312 C DE 850312C
- Authority
- DE
- Germany
- Prior art keywords
- interruption
- chambers
- compressed gas
- interruption point
- shut
- 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
Links
- 239000007789 gas Substances 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
-
- 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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
- H01H2033/146—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc using capacitors, e.g. for the voltage division over the different switches
Landscapes
- Circuit Breakers (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Description
Die Erfindung betrifft Druckgasschalter mit Mehrfachunterbrechung an der Leistungsschaltstelle und mit einer in Reihe liegenden Trennstelle für die Spannungsisolation, bei welchen die Löschkammern der verschiedenen Unterbrechungsstellen je für sich getrennte Abströmöfrnungen besitzen, durch welche die von den Unterbrechungsstellen abströmenden Schaltgase weggeleitet werden, wobei Absperrorgane für diese vorgesehen sind. Die Absperrung der Abströmöffnungen der Löschkammern dient dem Zweck, die Leistungsschaltkontakte bei Gegenwart von Druckgas öffnen zu können, wodurch die Lichtbogenlöschung und die Spannungshaltung begünstigt sowie der Kontakthub und damit die Schaltzeit verkleinert wird. Es ist an sich bekannt, aus einem Isolierteil mit metallischem Boden und Deckel bestehende Löschkammern, welche die Kontakte enthalten, aneinanderzureihen. Es ist ferner bekannt, Absperrorgane innerhalb oder außerhalb der Löschkammern unterzubringen, ao Bekannte Schalter dieser Art haben den Nachteil, daß sie nicht nur eine große Bauhöhe und dadurch bedingt eine Unstabilität aufweisen, sondern daß zufolge mehrfacher Umlenkung des Druckgasstromes die Abschaltleistung ungünstig beeinflußt wird. Die Bauhöhe der Schalter hat man dadurch verringert, daß man Löschkammern in Scheibenform mit metallischen Böden ausbildet, welche zentral heraustretende Kontaktelemente tragen, die beim Aneinanderreihen sich zu Unterbrechungsstellen ergänzen. Auch bei dieser Anordnung sind besondere Druckgaszuleitungen zu den Unter-The invention relates to compressed gas switches with multiple interruptions at the power switching point and with a line of separation for the voltage insulation, in which the arcing chambers the various interruption points each have separate outflow openings, through which the switching gases flowing away from the interruption points are conducted away, wherein Shut-off devices are provided for this. The blocking of the discharge openings of the extinguishing chambers serves the purpose of being able to open the circuit breaker contacts in the presence of pressurized gas, whereby the arc quenching and the voltage maintenance favors as well as the contact stroke and thus the switching time is reduced. It is known per se from an insulating part with a metallic one Bottom and cover of existing arcing chambers, which contain the contacts, to be strung together. It is also known to accommodate shut-off devices inside or outside the quenching chambers, ao Known switches of this type have the disadvantage that they not only have a large overall height and thereby conditionally show instability, but that as a result of multiple deflections of the pressurized gas flow the breaking capacity is adversely affected. This gives you the height of the switches reduced that one forms arcing chambers in disc shape with metallic floors, which wear centrally protruding contact elements that become interruption points when lined up add to. With this arrangement, too, special pressurized gas lines are required to
brechungssteilen notwendig, und es ergeben sich starke Umlenkungen für den Druckgasstrom.refraction parts necessary, and there are strong deflections for the pressurized gas flow.
Gegenstand der Erfindung ist nun ein Druckgasschalter mit Mehrfachunterbrechung, bei welchem die die Kontakte der aneinandergereihten Unterbrechungsstellen umgebenden Löschkammern aus rohrförmigen Isolierteilen und Metallteilen an den Rohrenden bestehen und abschließbare öffnungen für die von den Kammern abströmenden ίο Schaltgase besitzen, wobei der Metallteil die Form eines. Körpers besitzt, welcher auf beiden Seiten zentral heraustretende Kontaktelemente trägt, die beim Aneinanderreihen der Löschkammerteile zu Unterbrechungsstellen sich ergänzen, bei welchem neben einer Verkleinerung der Abmessungen eine günstige Druckgasführung erreicht ist, daß erfindungsgemäß die unmittelbar aneinandergereihten Löschkammern derart ausgebildet sind, daß sie für die Druokgaszuleitung zu den Unterbrechungsstelao len dienen, wobei die scheibenförmigen Metallteile der Löschkammern einteilig sind und außer Durchbrechungen für die durchgehende Verbindung der Löschkammern mindestens einen radial von innen nach außen sich erstreckenden, durch ein »5 besonderes Organ verschließbaren Kanal enthalten. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung in Fig. 1 und 2 dargestellt.The invention now relates to a pressure gas switch with multiple interruptions, in which the arcing chambers surrounding the contacts of the juxtaposed interruption points consist of tubular insulating parts and metal parts at the pipe ends and lockable openings for the ίο ο switching gases flowing out of the chambers, the metal part having the shape one. Has body, which carries centrally protruding contact elements on both sides, the when the extinguishing chamber parts are lined up to form interruption points, which in addition to a reduction in the dimensions, a favorable compressed gas flow is achieved that according to the invention the immediately lined up arcing chambers are designed such that they are for the Druokgas supply line to the interruption points are used, the disc-shaped metal parts the arcing chambers are in one piece and apart from openings for the continuous connection of the quenching chambers at least one extending radially from the inside to the outside through a »5 special organ closable canal included. In the drawing is an embodiment of the Invention shown in Figs.
Die Löschkammern O1 bis αβ (Fig. ι) sind aus je einem Isolierzylinder O10 und einer metallischen Boden- sowie einer metallischen Kopfplatte aufgebaut, welche die Kontakte der in der Löschkammer liegenden Unterbrechungsstelle tragen. Kopf- und Bodenplatte benachbarter Unterbrechungsstellen sind zu einem Konstruktionsteil bv b2 usw. vereinigt, der einerseits den festen Düsenkontakt c und den beweglichen Stiftkontakt d enthält. Dieser Metallteil besitzt ferner Durchtrittsöffnungen ev ex für das Druckgas zur Löschkammer und zur Unterbrechungsstelle und Ab-Strömöffnungen fit ft usw. für die Schaltgase von den Unterbrechungsstellen, wie in Fig. 2 dargestellt. Die beweglichen Kontakte d der Unterbrechungsstellen sind unter Federwirkung in einem Führungszylinder g geführt. In der Wand dieses Zylinders g ist ein Druckgaskanal h vorgesehen, welcher hinter den Kolben des Ventils i geführt ist. Das Ventil kann frei laufend sein oder unter Federwirkung geschlossen gehalten werden.The arcing chambers O 1 to α β (FIG. 1) are each constructed from an insulating cylinder O 10 and a metallic base plate and a metallic top plate, which carry the contacts of the interruption point located in the arcing chamber. The top and bottom plates of adjacent interruption points are combined to form a structural part b v b 2 etc., which on the one hand contains the fixed nozzle contact c and the movable pin contact d . This metal part further has passage openings e v e x for the compressed gas to the arcing chamber and the point of interruption and down Strömöffnungen f it t f etc. for the switching gases from the interruption points, as shown in FIG. 2. The movable contacts d of the interruption points are guided in a guide cylinder g under the action of a spring. In the wall of this cylinder g , a compressed gas channel h is provided, which is guided behind the piston of the valve i. The valve can run freely or be kept closed under the action of a spring.
Der Betätigungsmechanismus einer Unterbrechungsstelle ist also mit dem Kontaktteil einer benachbarten Unterbrechungsstelle zusammengebaut. Dabei wird das Absperrorgan (Ventil i) pneumatisch betätigt. Es steht natürlich nichts im Wege, das Absperrorgan einer Unterbrechungsstelle mechanisch in Abhängigkeit von der benachbarten Unterbrechungsstelle zu betätigen.The actuation mechanism of one interruption point is thus with the contact part of an adjacent one Interruption point assembled. The shut-off device (valve i) is pneumatic actuated. Of course, nothing stands in the way, the shut-off device of an interruption point is mechanical to be operated depending on the neighboring interruption point.
Fig. 2 zeigt die Unterbrechungsstelle in der Schließ- oder Ruhestellung. Tritt beim öffnen des nicht gezeichneten Blasventils aus einem ebenfalls nicht gezeichneten Druckgasbehälter Druckgas in die verschiedenen Löschkammern O1 bis O6 durch die öffnungen ev e2 usw., dann werden zunächst die beweglichen Kontakte d entgegen der Schließfeder von den festen Düsenkontakten c abgehoben. Die bewegten Kontakte d besitzen in ihrem Kopfteil eine Aussparung dv welche nach Zurücklegung eines bestimmten Kontakthubes eine Verbindung des Raumes der Löschkammer über den Kanal h hinter den Kolben des Ventils i herstellt, so daß Druckgas hinter den Kolben gelangt und das Ventil zeitverzögert schließt. Die Kontakte c, d stehen sich nunmehr bei Druckgas offen gegenüber. Wird das Blasventil geschlossen und dabei die Löschkammer entleert, so wird durch das ausströmende Druckgas das Ventil i geöffnet und auch der Raum zwisehen Düsenkontakt und Ventil entlüftet.Fig. 2 shows the interruption point in the closed or rest position. When the blow valve (not shown) is opened from a pressurized gas container (also not shown), pressurized gas enters the various arcing chambers O 1 to O 6 through the openings e v e 2 etc., then first the movable contacts d are lifted from the fixed nozzle contacts c against the closing spring. The moving contacts d have a recess d v in their head part which, after covering a certain contact stroke, connects the space of the quenching chamber via the channel h behind the piston of the valve i , so that pressurized gas passes behind the piston and the valve closes with a time delay. The contacts c, d are now open to each other in the case of pressurized gas. If the blow valve is closed and the extinguishing chamber is emptied, valve i is opened by the outflowing pressurized gas and the space between the nozzle contact and valve is also vented.
Anstatt die Absperrorgane einer Unterbrechungsstelle in Abhängigkeit der Kontaktbewegung der benachbarten Unterbrechungsstelle vorzunehmen, ist es ohne weiteres möglich, die Anordnung so zu treffen, daß das Absperrorgan pneumatisch in Abhängigkeit der Kontaktbewegung der gleichen Unterbrechungsstelle betätigt wird. In diesem Fall müßte im Isolierteil der Löschkammer jeder Unterbrechungsstelle ein achsparallel verlaufender Druckgaskanal vorgesehen werden.Instead of the shut-off devices an interruption point depending on the contact movement of the make adjacent interruption point, it is easily possible to arrange the arrangement in this way meet that the shut-off device pneumatically depending on the contact movement of the same Interruption point is operated. In this case, each interruption point would have to be in the insulating part of the quenching chamber an axially parallel compressed gas duct can be provided.
Die Absperrorgane können so ausgebildet sein, daß sie die Abströmung von zwei Unterbrechungsstellen gemeinsam steuern. Die Absperrorgane können ferner unter Zwischenfügung von Stützen od. dgl. an den metallischen Böden bzw. der Löschkammern angebracht sein.The shut-off devices can be designed so that they jointly control the outflow from two interruption points. The shut-off devices can also with the interposition of supports or the like. On the metallic floors or the arcing chambers to be appropriate.
Claims (4)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE210130X | 1938-05-27 | ||
CH2292252T | 1940-01-23 | ||
CH2331441X | 1940-06-08 | ||
CH2340827X | 1941-09-27 | ||
CH577502X | 1942-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE850312C true DE850312C (en) | 1952-09-22 |
Family
ID=32097093
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA1345A Expired DE850312C (en) | 1938-05-27 | 1940-06-28 | Compressed gas switch with multiple interruption |
DEA1359D Expired DE854390C (en) | 1938-05-27 | 1941-10-14 | Compressed gas switch with multiple interruption |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA1359D Expired DE854390C (en) | 1938-05-27 | 1941-10-14 | Compressed gas switch with multiple interruption |
Country Status (7)
Country | Link |
---|---|
US (4) | US2279536A (en) |
BE (5) | BE434538A (en) |
CH (6) | CH210130A (en) |
DE (2) | DE850312C (en) |
FR (5) | FR855174A (en) |
GB (3) | GB530971A (en) |
NL (2) | NL62315C (en) |
Families Citing this family (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR866412A (en) * | 1940-04-06 | 1941-08-12 | Merlin Gerin | High voltage compressed gas switch |
US2390966A (en) * | 1940-12-21 | 1945-12-11 | Ite Circuit Breaker Ltd | Air blast circuit breaker and control therefor |
FR871241A (en) * | 1941-04-01 | 1942-04-13 | Merlin Gerin | Improvements to compressed gaseous fluid switches |
DE967710C (en) * | 1941-04-03 | 1957-12-05 | Siemens Ag | Arc switch with extinguishing chamber |
NL57563C (en) * | 1942-02-19 | |||
BE458962A (en) * | 1942-05-29 | |||
GB571108A (en) * | 1942-11-11 | 1945-08-07 | Westinghouse Electric Int Co | Improvements in or relating to fluid blast-electric circuit interrupters |
BE454451A (en) * | 1943-02-18 | 1900-01-01 | ||
GB583896A (en) * | 1943-03-24 | 1947-01-02 | Asea Ab | Arrangement in compressed air blast electric circuit breakers |
BE477586A (en) * | 1943-07-17 | |||
BE457528A (en) * | 1943-09-11 | |||
US2470628A (en) * | 1944-05-24 | 1949-05-17 | Westinghouse Electric Corp | Circuit interrupter |
DE972096C (en) * | 1944-07-29 | 1959-05-21 | Siemens Ag | Installation on high-voltage converters |
US2459600A (en) * | 1944-12-14 | 1949-01-18 | Westinghouse Electric Corp | Compressed gas circuit interrupter |
US2459612A (en) * | 1944-12-22 | 1949-01-18 | Westinghouse Electric Corp | Compressed gas circuit interrupter |
US2442190A (en) * | 1945-03-23 | 1948-05-25 | Gen Electric | Electric circuit interrupter |
BE466734A (en) * | 1945-07-31 | |||
US2619563A (en) * | 1945-08-07 | 1952-11-25 | Kesselring Fritz | Electromagnetic control device |
US2581571A (en) * | 1945-10-24 | 1952-01-08 | Westinghouse Electric Corp | Circuit interrupter |
BE480095A (en) * | 1947-02-03 | |||
US2558757A (en) * | 1947-07-19 | 1951-07-03 | Allis Chalmers Mfg Co | Multibreak gas blast circuit breaker with grounded operating motor |
US2530939A (en) * | 1947-09-27 | 1950-11-21 | Westinghouse Electric Corp | Circuit interrupter with arc extinguishing shunt |
US2586290A (en) * | 1947-11-01 | 1952-02-19 | Westinghouse Electric Corp | Circuit interrupter |
US2658977A (en) * | 1948-05-08 | 1953-11-10 | Electrical Eng Equipment Co | Electrical load break switch |
US2635159A (en) * | 1948-08-09 | 1953-04-14 | Asea Ab | Arrangement in air blast circuit breakers |
US2567022A (en) * | 1948-12-03 | 1951-09-04 | Milliken Humphreys | Air-blast circuit breaker |
US2658976A (en) * | 1948-12-03 | 1953-11-10 | Electrical Eng Equipment Co | Air circuit interrupter |
US2645698A (en) * | 1949-01-04 | 1953-07-14 | William C Gregory | Nonarcing interrupting switch |
GB667004A (en) * | 1949-01-18 | |||
US2675505A (en) * | 1949-12-02 | 1954-04-13 | Gen Electric | Multibreak circuit breaker with protective impedances |
DE854962C (en) * | 1950-08-10 | 1952-11-10 | Licentia Gmbh | Electrical high-voltage switch with one or more power interruption points and at least one special voltage disconnection point |
DE931609C (en) * | 1951-09-26 | 1955-08-11 | Heraeus Gmbh W C | Switching arrangement for suppressing the opening arc on switches for electrical circuits |
DE1013346B (en) * | 1952-03-19 | 1957-08-08 | Voigt & Haeffner Ag | Compressed air switch |
BE526782A (en) * | 1953-02-26 | |||
US2813953A (en) * | 1954-08-16 | 1957-11-19 | Ite Circuit Breaker Ltd | Circuit interruptions with non-linear resistance |
DE1007854B (en) * | 1954-10-30 | 1957-05-09 | Licentia Gmbh | Arrangement for capacitive voltage control in high-voltage switches with multiple interruption lines |
CH328233A (en) * | 1955-02-16 | 1958-02-28 | Bbc Brown Boveri & Cie | Compressed gas switch with multiple interruption |
US2921168A (en) * | 1956-03-19 | 1960-01-12 | Asea Ab | High tension air blast circuit breaker comprising a number of breaking units with breaking contacts arranged inside air containers carried by insulator pillars |
US2830234A (en) * | 1956-08-01 | 1958-04-08 | Mc Graw Edison Co | Arrangement for switching shunt capacitor banks |
US2951981A (en) * | 1956-08-10 | 1960-09-06 | Mc Graw Edison Co | Capacitor bank |
BE564098A (en) * | 1957-01-22 | |||
US3030481A (en) * | 1957-12-23 | 1962-04-17 | S & C Electric Co | Switch construction |
GB898463A (en) * | 1957-12-23 | 1962-06-06 | S & C Electric Co | Improvements in electrical circuit interrupters |
US2984820A (en) * | 1958-01-24 | 1961-05-16 | Franklin B Kennell | Burglar alarm for automobiles |
DE1052503B (en) * | 1958-05-16 | 1959-03-12 | Licentia Gmbh | Electrical high voltage switch with multiple interruption |
DE1236052B (en) * | 1960-10-26 | 1967-03-09 | Continental Elektro Ind Ag | High-voltage circuit breaker with several switching points connected in series per pole |
US3147356A (en) * | 1961-03-15 | 1964-09-01 | Joslyn Mfg & Supply Co | Circuits for switches having series connected interrupter sections |
JPS58154124A (en) * | 1982-03-09 | 1983-09-13 | 株式会社東芝 | Buffer gas breaker |
EP0106264A1 (en) * | 1982-10-09 | 1984-04-25 | Mitsubishi Denki Kabushiki Kaisha | Power switch apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH177041A (en) * | 1933-07-21 | 1935-05-15 | Bbc Brown Boveri & Cie | Pressure switch with flowing extinguishing agent and several extinguishing points. |
CH178660A (en) * | 1933-07-31 | 1935-07-31 | Bbc Brown Boveri & Cie | Compressed gas switch with control of the extinguishing agent on the outflow side of the extinguishing gas. |
CH190516A (en) * | 1935-07-13 | 1937-04-30 | Bbc Brown Boveri & Cie | Switch arrangement for high performance. |
CH202949A (en) * | 1936-12-12 | 1939-02-15 | Bbc Brown Boveri & Cie | Multiple break switch. |
-
0
- NL NL61773D patent/NL61773C/xx active
- BE BE453422D patent/BE453422A/xx unknown
- NL NL62315D patent/NL62315C/xx active
- BE BE441662D patent/BE441662A/xx unknown
- BE BE440379D patent/BE440379A/xx unknown
- BE BE447360D patent/BE447360A/xx unknown
- BE BE434538D patent/BE434538A/xx unknown
-
1939
- 1939-05-16 CH CH210130D patent/CH210130A/en unknown
- 1939-05-18 GB GB14829/39A patent/GB530971A/en not_active Expired
- 1939-05-23 FR FR855174D patent/FR855174A/en not_active Expired
-
1940
- 1940-01-23 CH CH214340D patent/CH214340A/en unknown
- 1940-02-08 US US317948A patent/US2279536A/en not_active Expired - Lifetime
- 1940-02-28 CH CH214838D patent/CH214838A/en unknown
- 1940-06-08 CH CH215598D patent/CH215598A/en unknown
- 1940-06-28 DE DEA1345A patent/DE850312C/en not_active Expired
-
1941
- 1941-01-16 FR FR51343D patent/FR51343E/en not_active Expired
- 1941-03-13 US US383218A patent/US2292252A/en not_active Expired - Lifetime
- 1941-05-28 US US395691A patent/US2331441A/en not_active Expired - Lifetime
- 1941-05-29 FR FR51592D patent/FR51592E/en not_active Expired
- 1941-09-27 CH CH221839D patent/CH221839A/en unknown
- 1941-10-14 DE DEA1359D patent/DE854390C/en not_active Expired
-
1942
- 1942-09-05 GB GB12558/42D patent/GB554967A/en not_active Expired
- 1942-09-24 US US459547A patent/US2340827A/en not_active Expired - Lifetime
- 1942-09-26 FR FR52488D patent/FR52488E/en not_active Expired
- 1942-12-21 CH CH230427D patent/CH230427A/en unknown
-
1943
- 1943-11-10 FR FR53681D patent/FR53681E/en not_active Expired
-
1944
- 1944-03-24 GB GB5520/44A patent/GB577502A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH177041A (en) * | 1933-07-21 | 1935-05-15 | Bbc Brown Boveri & Cie | Pressure switch with flowing extinguishing agent and several extinguishing points. |
CH178660A (en) * | 1933-07-31 | 1935-07-31 | Bbc Brown Boveri & Cie | Compressed gas switch with control of the extinguishing agent on the outflow side of the extinguishing gas. |
CH190516A (en) * | 1935-07-13 | 1937-04-30 | Bbc Brown Boveri & Cie | Switch arrangement for high performance. |
CH202949A (en) * | 1936-12-12 | 1939-02-15 | Bbc Brown Boveri & Cie | Multiple break switch. |
Also Published As
Publication number | Publication date |
---|---|
BE447360A (en) | |
GB554967A (en) | 1943-07-27 |
CH214838A (en) | 1941-05-15 |
BE434538A (en) | |
FR51592E (en) | 1943-02-05 |
DE854390C (en) | 1953-01-05 |
CH215598A (en) | 1941-06-30 |
BE440379A (en) | |
GB577502A (en) | 1946-05-21 |
NL61773C (en) | |
BE441662A (en) | |
NL62315C (en) | |
US2292252A (en) | 1942-08-04 |
US2279536A (en) | 1942-04-14 |
FR51343E (en) | 1942-04-15 |
CH221839A (en) | 1942-06-15 |
CH210130A (en) | 1940-06-15 |
FR855174A (en) | 1940-05-04 |
US2331441A (en) | 1943-10-12 |
BE453422A (en) | |
US2340827A (en) | 1944-02-01 |
CH214340A (en) | 1941-04-15 |
FR53681E (en) | 1946-07-11 |
CH230427A (en) | 1943-12-31 |
GB530971A (en) | 1940-12-27 |
FR52488E (en) | 1945-04-16 |
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