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1888-today
in 1888 Heinrich Hertz detects and produces radio waves -
1894
marchese guglielmo mareon builds his first radio equipment -
1899
marconi establishes first radio link between england and france -
1900
american scientist R.A.fressenden transmits humen speech via radio waves -
1901
marcioni transmits telegragraphc radio messages from cornmell to new forundland -
1904
first radio transmission of music at Graz,Austria -
1905
marconi invents the direction radio -
1906
first radio program of voice and music broudcast in the U.S.. -
1907
fessenden invents a hgih-frequency electric generater produces radio waves with a frequency