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DEV MOV VALVE, 1925

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DEV MOV VALVE, 1925

The Marconi Osram Valve Companies DEV Triode Valve of 1925, with dull emitter filament. See Item A0630.

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A0626



2007 The Museum of Technology, The Great War and WWII
Company registered in England No. 7452160, Registered Charity No. 1140352, Accredited Museum No. 2221