Wade Bequest collection of valves: small triode radio valve, by Marconi-Osram
- PART OF:
- Wade Bequest collection of valves
- Made:
- 1921 in England, Germany and United States
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Wade Bequest collection of valves: small directly-heated triode radio valve, by Marconi-Osram. With B4-3 base and top seal. With paper label: 1921
