Dopyera set to work, and over the following months invented a guitar with three aluminum cones mounted underneath the bridge, an amplification scheme similar to the diaphragms inside a speaker.
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Joined by his brothers Rudy and Emil, as well as a group of willing investors, Dopyera founded the National String Instrument Corporation.
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The company was formed by John Dopyera, the luthier who invented the resonator, and George Beauchamp, a steel guitar player who had suggested to Dopyera the need for a guitar loud enough to play a melody over brass and other wind instruments.