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Three original thermionic valves invented by Sir John Ambrose Fleming, 1889

Three original thermionic valves devised by Sir John Ambrose Fleming in 1904, using filament lamps made by the Edison and Swan United Electric Light Company, London, in 1889

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One of Fleming's first thermionic diode valves, 1889

1889

One of Fleming's first thermionic diode valves, 1889

1889

One of Fleming's first thermionic diode valves, 1889

1889