KDKA Pittsburgh 11/2/1920 - 1st commerical broadcast

"On November 2, 1920, station KDKA made the nation's first commercial broadcast... They chose that date because it was election day, and the power of radio was proven when people could hear the results of the Harding-Cox presidential race before they read about it in the newspaper." (via http://www.pbs.org/wgbh/aso/databank/...)

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