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Heinrich Hertz started to experiment on how to make a wireless connection.
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Marconi sent the first wireless message over the Bristol Channel in Wales at a distance of 6km.
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Nikola Tesla invents and develops the Tesla Coil, witch will later be used to help invent radio
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The AUDION tube was invented in 1906 it is basically the very first amplifier
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The very first modern radio station (KDKA) was made, it is the first version of what radio is now.
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During the great depression radio became vary popular for its entertainment value. There were songs, plays, comedy shows and much of what we expect on modern radio.