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the first radio transmitter station, milan, 1907 Stock Photo - Alamy
The Development of Radio | American Experience | Official Site | PBS
Au Maroc, Casablanca fut la première ville a utilisé un système radio à base de fréquence radioélectrique en 1907 | LTE Magazine
Lee DE Forest.org
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linea del tiempo de la Radio timeline | Timetoast timelines
A homemade Audion radio receiver constructed by an amateur radio hobbyist 1914. The Audion (triode), the first amplifying vacuum tube, was invented by Lee De Forest in 1907 but was not widely
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History of radio - Wikipedia
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First radio telephone transmitter and receiver, 1907 — Calisphere
Lee de Forest | American inventor | Britannica
