McVitie Weston valve collection, Mazda valve, type PEN/DD/4020
- c. 1937
Mazda valve, type PEN/DD/4020, Marked DUMMY, one pin clipped, pinch marked Pen/40/20/S, stem marked 224, (RMW/Y166 - McVitie Weston number), by British Thomson-Houston Company Limited, c. 1937.
- Electronic Components
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- STC plc
- Permanent collection
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