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