McVitie Weston valve collection
- Made:
- 1919-1920 in United States
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LicenseMOV miniature triode, type D.E.V
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MOV miniature triode, type D.E.V., B4 base, etched R50, (RMW/C17A - McVitie Weston number), by Marconi Osram Valve Company Limited.
