U.S. Patent 2,594,740, filed on behalf of Lee de Forest and William A. Rhodes, describes a device for amplifying the intensity of radiation.
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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Rhodes, William A., and Lee De Forest. “Patent for Electronic Light Amplifier,” April 29, 1952. Beckman Historical Collection, Box 1, Folder 18. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2227mq412.
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