Low temperature emitter valve, type D.E.R. W/T, by

Made:
1920-1923 in United Kingdom
maker:
M-O Valve Company Limited

Low temperature emitter valve, type D.E.R. W/T, by M-O Valve Co. Limited, British, 1920-1923

Details

Category:
Radio Communication
Object Number:
1923-624
credit:
M.O. Valve Co. Ltd. (formerly Marconi-Osram Valve Co. Ltd.)

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