Year 1908.
2 April: Lee De forest experiments with his triode in France by broadcasting from the Eiffel Tower .
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Year 1906.
Reginald Fessenden (U.S.A.) constructs a high-frequency alternator and succeeds in transmitting the human voice via radio. 25 October: Lee de Forest (U.S.A.) applies for a patent on the triode, a 3-electrode valve that make possible the detection, transmission and amplifications of radio signals .