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401_403.zip *.djvu : Thermionic tubes in radio telegraphy and telephony Scott-Taggart, John Publisher London, New York, The Wireless press, 1921
http://www.archive.org/details/therm...besi00scotrich
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Theory of Thermionic Vacuum Tubes, E. Leon Chaffee, Ph.D., 1933
http://www.pmillett.com/Books/chaffee.pdf
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