![Wade Bequest collection of valves: Marconi-Osram Valve radio valve type D43 | Science Museum Group Collection Wade Bequest collection of valves: Marconi-Osram Valve radio valve type D43 | Science Museum Group Collection](https://coimages.sciencemuseumgroup.org.uk/images/448/718/medium_SMG00237757.jpg)
Wade Bequest collection of valves: Marconi-Osram Valve radio valve type D43 | Science Museum Group Collection
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9780953716609: British Radio Valves: The Vintage Years - 1904-1925 - Thrower, Keith R.: 0953716600 - AbeBooks
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Free Images : technology, vintage, old, radio, valves within, receptor, electronic device, communication device, telefunken 4365x3274 - - 820869 - Free stock photos - PxHere
![Wade Bequest collection of valves: early triode radio valve by Marconi-Osram, 1926 | Science Museum Group Collection Wade Bequest collection of valves: early triode radio valve by Marconi-Osram, 1926 | Science Museum Group Collection](https://coimages.sciencemuseumgroup.org.uk/images/448/597/medium_SMG00237636.jpg)