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Audion Vacuum Tube - History Computer
https://history-computer.com/the-audion-vacuum-tube/
De Forest’s involvement in wireless telegraphy led to the development of the Audion (also known as the De Forest valve, and since 1919, the triode). It was created in 1905, and De Forest filed a patent for a diode vacuum tube sensor in January 1906.
De Forest’s 20th-Century Triode or Audion Amplifier (1907)
https://scalar.usc.edu/maker/record/media/deforestaudion
1 2013-12-14T06:38:41-08:00 De Forest’s 20th-Century Triode or Audion Amplifier (1907) 5 Lee De Forest, US Patent 841386 A, for Wireless Telegaphy and the Audion Amplifier (1907) plain 2013-12-26T19:55:37-08:00
Lee DE Forest.org
https://www.leedeforest.org/The_Audion.html
Above, the original Fleming patent for the diode or 2-element vacuum tube. Below, the first de Forest diode patent and a tube showing a close-up of the three elements of a triode. The first patent for the 3-element Audion. it was filed in January 1907 Order now from Amazon.com, "Lee de Forest, King of Radio, Television, and Film" by Mike Adams
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