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  First printed music
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  The recording was originally made on a Thomas Edison-invented phonograph in St. Louis.
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  Nikola Tesla discovered the basis for most alternating-current machinery.
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  Henirich Hertz was the first to prove that you could ransmit and receive electric waves wirelessly.
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  The development of the radio began with Nikolai Tesla’s demonstration of wireless radio communication in St. Louis, Missouri.
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  Reginald Fessenden developed a way to combine sound and radio carrier waves.
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  Reginald Fessenden made the first longrange transmission of voice from Brant Rock, MA.
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  First radio transmission from an airplane.
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  The Radio Act of required all land radio stations and ship stations to be staffed 24 hours a day, 7 days a week.
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  WEAF, an AT&T station in New York broadcasted the first radio advertisement.
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  One-way police radio communication
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  Long range shortwave voice transmission from Byrd Antarctic Expedition.
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  Military controls broadcasting in Soviet-occupied Germany and
 Astronomers develop radioastronomy
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  First human communication from space and
 First amateur radio satellite
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  Development of systematic musical notation.
