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first radio signal sent and recieved by italian inventor marconi
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lee de forest made the audion tube publicly known despite the fact that someone else really invented it
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first radio station was created by Frank Conrad
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a radio station first made a 1o minute ad for an apartment complex charging $50
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first brought organization to the process where only certain people could have certain frequencies
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the time when radio was extremely populr because had nothing to do but to listen to radio.
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FM was introduced and then radio started sounding better
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tv brought radio to a close because now people could watch shows and have visual content
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music plays on the radio and filled the void on the radio
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it became known that AM would be for talk and FM would be for music
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sony jumps in the game with music unlimited to compete with pandora and youtube
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google launches music subscription service to hear any song ad free
