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Valves Valves Valves Valves Valves
Early British Valve (1905)
Fleming's Tube or Thermionic Valve or Electron Tube
Experimental Fleming Diode (1904)
Light Bulb
Light Bulb
Valves Valves Valves Valves Valves
Miniature valve (1960s)
Small glass-based valve from 1940s
Audion valve
Fleming experimental bulb
Thermionic valve.
Valves Valves Valves Valves
Window with arrows coming out of it.
Triode valve, 1920s.
Triode valve
Radio valve.
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