Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial business ventures included work in radio, telegraphy, telephony, broadcasting, and film.
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Hessler Studio. “Portrait of Lee De Forest (1873–1961),” February 10, 1955. Beckman Historical Collection, Box 1, Folder 18. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4t64gn939.
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