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Revision as of 10:22, 30 October 2001 by 213.253.39.xxx (talk)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)A vacuum tube electronic device, invented in 1904 by J. Ambrose Fleming, scientific adviser to the Marconi company based on an observation by Thomas Edison.
The predecessor of semiconductor electronic devices.
Thermionic valve devices include diodes, triodes, tetrodes, and pentodes.
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