Radio Timeline By k_oneil_world_3 Mar 17, 1861 James Maxwell ectromagnetic waves. electromagnetic waves. Mar 17, 1878 David E. Hughes was the first to transmit and receive waves Mar 17, 1893 a public demonstration of "wireless" radio communication. Mar 10, 1895 The radio signal Guglielmo Marconi is an Italian inventor, who dicovered the signal. Mar 17, 1897 Marconi established the radio station Mar 17, 1898 Marconi opened the first radio factory Mar 17, 1916 First regular broadcasts on 9XM Mar 17, 1919 First clear transmission of human speech Mar 17, 1920 Regular wireless broadcasts for entertainment began Mar 17, 1925 Inventions of the triode amplifier, generator