McVitie Weston valve collection
- Made:
- circa 1925 in United States and Canada
- maker:
- A C Cossor Limited
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Cossor output triode valve, type W.3., B4 base, with green painted spot on top of glass envelope, marked No. A531P, (RMW/D5 - McVitie Weston number), by A C Cossor Limited, c. 1925.
