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Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, electrical engineer and an early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier , the three-element " Audion " triode vacuum tube in 1906.
In 1906 Lee de Forest developed a three-element vacuum tube, that he named the Audion, and which he maintained had been developed separately from the Fleming's work. Over the next few years de Forest's device would be improved until it could be used for high quality reception and amplification, as well as for radio transmitters.
Lee de Forest, while decrying the excesses of the company's senior management, had good things to say about some of the technical staff, writing: "Charles Galbraith and his corps of honest, capable, hard-working men, engineers, and operators who had been instrumental in building up the American De Forest Wireless Telegraph Company, had gone ...
(Includes comments from de Forest.) The Audion: A new Receiver for Wireless Telegraphy, Lee de Forest, Scientific American Supplement No. 1665, November 30, 1907, pages 348-350, Scientific American Supplement No. 1666, December 7, 1907, page 354–356. Lee de Forest's Audion Piano on '120 years Of Electronic Music'
In 1911–13, Lee De Forest and two assistants worked at Federal Telegraph on the first vacuum tube amplifier and oscillator, which De Forest called the "Oscillaton" after his earlier Audion. California Historical Landmark No. 836 at the corner of Channing and Emerson in Palo Alto, California at the original location of FTC laboratory
Smart Axiata Co., Ltd Incorporates the former Hello Axiata and Star-Cell [4] Mobitel CamGSM Co., Ltd. Also known as Cellcard; Incorporates the former Mfone [5] CooTel Xinwei (Cambodia) Telecom Co., Ltd [6] [7] SEATEL Southeast Asia Telecom (Cambodia) Co., Ltd. Incorporates the former GT-TEL [8] Metfone Viettel (Cambodia) Pte., Ltd.
Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s. In 1919 and 1920, de Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photographically ...
After reform initiatives, the Singaporean telecommunication industry became streamlined and largely directed by the government, which viewed such policy as critical in shaping societal preferences and in directing the state's economy. [2]