Harvey Fletcher
Lars Magnus Ericsson

Reginald Fessenden

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Reginald Fessenden
From Wikipedia

Reginald Aubrey Fessenden (October 6, 1866 – July 22, 1932) was a Canadian-American electrical engineer and inventor who received hundreds of patents in fields related to radio and sonar between 1891 and 1936 (seven of them after his death).
Fessenden pioneered developments in radio technology, including the foundations of amplitude modulation (AM) radio. His achievements included the first transmission of speech by radio (1900), and the first two-way radiotelegraphic communication across the Atlantic Ocean (1906). In 1932 he claimed that, in late 1906, he had also made the first radio… More on Wikipedia →

Timeline events (1)

Fessenden achieves first wireless voice transmission