McVitie Weston valve collection, Tungsram valve, type SP4B
- c. 1936
Tungsram valve, type SP4B, marked X9 447 and 8899, (RMW/Y226 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd., c. 1936.
- Electronic Components
- Object Number:
- STC plc
- Permanent collection
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