Joined by his brothers Rudy and Emil, as well as a group of willing investors, Dopyera founded the National String Instrument Corporation.
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.
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In their 1930 catalog, National list eight key associates, including Adolph Rickenbacker, George Beauchamp, Harry Watson, Paul Barth, and Jack Levy.
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Gary Lucas – glass–finger guitar, slide guitar, guitar, National steel duolian
Knopfler used several guitars during the sessions, including four Schecter Stratocasters—two red, one blue, and one sunburst—a black Schecter Telecaster, an Ovation classical guitar on "Private Investigations" and "Love Over Gold", a custom Erlewine Automatic on "Industrial Disease", and his 1937 National steel guitar on "Telegraph Road".