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Carbon heater
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BE409144A
(enrdf_load_stackoverflow)
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(en)
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Tube construction
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Electric heater assembly
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Electrode assembly for electron space discharge device
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(en)
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Electron discharge tube
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Filament support for electric space discharge tubes
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Vacuum electric-tube device
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Space discharge tube
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Electron discharge device
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Electron discharge device
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Vacuum tube
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Vacuum tube elements assembly
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Pentode tube
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Electrode spacer
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Cathode-grid spacing means
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Grid stop
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Double diode
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Filament support for vacuum tubes
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Electronic vacuum tube
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Vacuum tube grid
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Filamentary stacked triode
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Space discharge device
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CH112865A
(fr)
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Dispositif de support d'une grille en fil, formée d'une série de spires, dans un tube électrique à vide.
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(en)
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Electric discharge apparatus
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