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Description
de Forest triodes on display at Cavalcade of Electronics, with exhibit label: "The great developments in modern electronics began with de Forest when in 1906 he inserted the grid, or third element, producing the triode."
Type
image
Format
Black & White
Identifier
4795EEDC-251A-4B16-9436-022643228399 2003-59-255
Subject
Audion Vacuum-tubes (LCSH) Amplifiers (Electronics) (LCSH) Electronics--History (LCSH) De Forest, Lee
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