Wireless valve, Osram A.T.40, 1921, Transmitting Triode , (filament broken)
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Wireless valve, Osram A.T.40, 1921, Transmitting Triode , (filament broken)
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Wireless valve, Osram A.T.40, 1921, Transmitting Triode , (filament broken)
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Wireless valve, Osram A.T.40, 1921, Transmitting Triode , (filament broken)
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Wireless valve, Osram A.T.40, 1921, Transmitting Triode , (filament broken)
Science Museum Group Collection
© The Board of Trustees of the Science Museum