McVitie Weston valve collection
- Made:
- circa 1933 in Canada and United States
- maker:
- Osram
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LicenseOsram Catkin tetrode valve, type MS4B, B5 base
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Osram Catkin tetrode valve, type MS4B, B5 base, no screening can, with top terminal, marked dummy, (RMW/G64 - McVitie Weston number), by Osram, c. 1933.
