McVitie Weston valve collection
- Made:
- 1929 in United States
- maker:
- Osram
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LicenseOsram output triode valve, type P.X.4
Science Museum Group
© The Board of Trustees of the Science Museum
Osram output triode valve, type P.X.4., B4 base, (RMW/C56 - McVitie Weston number), by Osram, 1929.
