1891	Electric Machinery founded as a service shop.
1897	Electric Machinery Manufacturing Company began manufacturing.
1944	Worthington Machinery Corporation purchased Electric Machinery Manufacturing Company from Silas McClure, private owner, and EM became wholly-owned subsidiary of Worthington.
1967	Worthington and Studebaker merged and became Studebaker-Worthington, Incorporated.
1970	Turbodyne Corporation formed consisting of Electric Machinery Manufacturing Company and Worthington Turbine International.
1971	Turbodyne Corporation had three major operations - EM, Worthington Steam Turbine, and Turbodyne Gas Turbines.
1978	Turbodyne Gas Turbine plant in St. Cloud, MN, sold to Brown Boveri Corporation and Turbodyne Corporation remaining Operations continued as part of Studebaker-Worthington.
1979	McGraw-Edison Company acquired Studebaker-Worthington, Incorporated.
1980	Electric Machinery aligned with Power Systems Division of McGraw-Edison Company.
1983	Electric Machinery aligned with Service Division of McGraw-Edison Company.
1984	EM & Turbodyne were acquired by Dresser Industries, Inc.
1987	EM & Turbodyne were included in merger by Dresser Industries, Inc. and Ingersol-Rand forming a partnership, Dresser-Rand Company.
1997	EM became the Motor & Generator Division of Dresser-Rand.
1999	Ideal Electric Holding Company purchased EM and the Electric Machinery Company was reborn.
2006-2007	Converteam acquiring Electric Machinery