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1900
The canadian Reginald Aubrey Fessenden performs the first radio transmission with with human voice -
1913
Edwin Howard Armstrong invents the regenerative circuit that increases the quality of emissions -
1935
Edwin Armstrong describes frequency modulation (FM) for the first time. by not initially using his invention he committed suicide -
1940
In this decade, the first frequency modulated station to broadcast regularly, WSM,FM from Nashville, Tenesse, begins to operate -
1947
The first medium wave transistor that is carried in the hand is invented -
1991
English company trevor baylis patents the first clock radio in history