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Ancient History

Thermionic valve 1920 -

Thermionic valve, 1920 - drawing of the valve, resulting from Sir Ambrose Fleming 's invention of 1904, that revolutionised wireless telephony. Fleming: 29 November 1849 - 18 April 1945.

1803 images from Lebrecht Music & Arts available as Prints and Photo Gifts

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Thermionic valve 1920 - Keywords
drawing, early 20th century, physicist, radio, science, scientist, social history, technology, thermionic, twenties, valve

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