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Guglielmo Marconi sends the first ever radio signal.
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Lee De Forest Creates The Audion Tube which is a vacuum that amplifies signals.
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The radio on the Titanic makes it possible for them to signal the land when they are sinking.
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KDKA (called 8XK at the time) airs for the very first time out of Pittsburgh, Pennsylvania in 1920.
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The first 10 minute radio commercial airs on WEAF for an apartment complex for $50.
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The Federal Radio Commission is established because personal radio use was not regulated.
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The golden era of radio starts in the early 1930s and lasts to the 1940s.
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T.V. makes and appearance in the late 30s and starts to make radio obsolete.
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Radio makes a comeback by playing music on FM radio.