McVitie Weston valve collection, Mullard valve, type SP4B
- Made:
- 1937
- maker:
- Mullard Limited
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Science Museum Group
© The Board of Trustees of the Science Museum
Mullard valve, type SP4B, gold metallized
Science Museum Group
© The Board of Trustees of the Science Museum
Mullard valve, type SP4B, gold metallized, (RMW/Y544B - McVitie Weston number), by Mullard Limited, 1937.
