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GB341520A
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Method of connecting directly heated incandescent filaments of electron valves to the power mains
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GB318259A
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Electric condenser especially for multiple valves
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GB296410A
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Improved support for the electrode systems of electronic valves
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GB296375A
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Arrangement of electric wire leads through glass parts
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GB296005A
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Improvements in thermionic valves
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ES103633A1
|
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Tubular unit for voltage boosters.
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GB267168A
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Improvements relating to multiple thermionic valves
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