Single-phase motors; polyphase motors; direct current motors ; radio components ; Founded in Dayton, Ohio, in 1889, the Dayton Fan and Motor Company made fly and ventilating fans. In the 1920s, as the Day-Fan Electric Company, it began to join in the rush to capitalize on the growth of radio with a line of components. Ultimately, the company was bought by General Motors in 1929, and General Motors Radio Corp. was created. This company was liquidated in 1931 as a result of an antitrust suit involving GM's alleged collusion with RCA. ( http://www.antiqueradio.com/Jan05_Schecter_DayFan.html )