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Aug 21, 2008
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Lee de Forest

Born: 1873
Birthplace: Council Bluffs, Iowa

Audion amplifier—De Forest inserted a third electrode between the cathode and anode to make his audion tube. Radio signals are picked up by connecting an antenna to the tube's grid. (1977)

Died: 1961

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John DeereThe National Inventors Hall of FameRobert Heath Dennard
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