McVitie Weston valve collection
- Made:
- United States and Canada
- maker:
- Mullard Limited
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LicenseMullard valve, type PM3A, marked 7A29
Science Museum Group
© The Board of Trustees of the Science Museum
Mullard valve, type PM3A, marked 7A29, (RMW/D44 - McVitie Weston number), by Mullard Limited.
