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Clapp-oscillator tube.svg
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Nmr tube cleaner.svg
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Transitron oscillator circuit.svg
SLNSW 11766 Tubeboiler being installed.jpg
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Carius tube V.1.svg
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Triode with filament and cathode labeled.svg
Triode schematic labeled.svg
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Transitron characteristic.svg
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Roentgen-Roehre.svg
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