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Guglielmo Marconi "invented" the first radio transmitter and receiver. This signal was most likely just morse code or a noise, rather than voice or music. It is not 100% confirmed that marconi was the first but he is the person who is credited for it.
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The Audion Tube is a device that would transmit the radio signals farther than they originally could, acting as an amplifier. The Audion Tube was "invented" by Lee De Forest. It is believed that Inventor from Canada, Reginald Fessenden was the real creator.
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The First Ever Radio Station was created by Frank Conrad in 1920.
