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University of Illinois at Chicago Century of Progress World's Fair, 1933-1934 (University of Illinois at Chicago)
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"A display of small apparatus which includes some new developments, such as the Thyratron speed control
1. "A display of small apparatus which includes some new developments, such as the Thyratron speed control for motors, quiet operating motor on sound isolating base, and gear motors, supplemented by models of large equipment represents the apparatus section of the General Electric Company in its exhibit at the Century of Progress."
   
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