McVitie Weston valve collection, Mullard valve, type D0.40
- maker:
- Mullard Limited
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Mullard valve, type D0.40, marked 319, pinch marked S
Science Museum Group
© The Board of Trustees of the Science Museum
Mullard valve, type D0.40, marked 319, pinch marked S. red moulded Becol 4-pin base loose from glass, filament broken, (RMW/J32 - McVitie Weston number), by Mullard Limited.
