McVitie Weston valve collection
- Made:
- 1921 in United States
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LicenseM-O early dull emitter valve, type Marconi T
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M-O early dull emitter valve, type Marconi T.2, B4 base, pinch marked SR, (RMW/C11 - McVitie Weston number), by M-O Valve Co. Limited and General Electric Company Limited, 1921.
