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In 1885 Henirich Hertz a German physicist was the first to prove that you could transmit and receive electric waves wirelessly. So he studied and found that you could send signals to other things this later turned into the radio.
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Nikola Tesla wirelessly transmitted electromagnetic energy. He made the first public demonstration of radio in St. Louis in 1893.
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Guglielmo Marconi filed for patent protection of his radio apparatus. He established the Wireless Telegraph and Signal Company in 1897.
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First trans-Atlantic signal sent by Marconi from Ireland to Canada.
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First radio transmission from an airplane, from the ground.
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Regulation of American airwaves begins. Amateurs had to be licensed and ships had to have a radio and trained operators to start.
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All U.S. radio stations not needed by the government are closed as WWI begins.
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the first broadcast on the radio all around.
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The FCC reallocated spectrum at 2 GHz for emerging
digital mobile services.