Lee DeForest
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The "King of Radio"
Created the first triode vacuum tube, and named it the audion - a detector of sound
Thought of the idea for wireless audio communication

1908 The Audion

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"Electronic amplifying vacuum tube"
Detects radio signals - makes them audible
Provides amplification
Made by combining gas and electricity to power sound (from the electrical grid within)
Distributed to the U.S. Navy - 1920s
Used as radio transmitters
Used in tube radios, which were then common household items