Diamond Electric Mfg. Corp designs, manufactures, and distributes automotive electrical components, with U.S. production centered at its Eleanor, West Virginia plant. Founded in 1937, Diamond Electric traces its history to Inosuke Tomita and says its U.S. ignition-coil production began in 1997. Its U.S. operations also include a research and sales office in Farmington Hills, Michigan.
ISO 14001:2015
IATF 16949
Dongan Electric Manufacturing CompanyFounded in Albany, New York, in 1909, Dongan Electric Manufacturing Company is a long-established Detroit-area manufacturer with roots in the early automotive trade. After beginning as the Dongan Electric Instrument Company, it evolved into a maker of transformers and inductors, serving OEMs and end users worldwide with standard and custom-engineered power equipment.PIONEER, OH
Niterra North America, IncWith roots reaching back to 1936, Niterra North America manufactures automotive ignition, sensor and vehicle-electronics components under the NGK and NTK brands. The Wixom-based company traces its U.S. manufacturing history to spark-plug assembly in 1976 and oxygen-sensor production in West Virginia beginning in the 1980s, while its products serve both original-equipment manufacturers and the aftermarket. Niterra also supports racing and runs a program that rewards technicians for recycling used oxygen sensors.SISSONVILLE, WV
Stimple and Ward CompanyFounded in 1898 by two of George Westinghouse’s engineers, Pittsburgh’s Stimple & Ward Company manufactures electric motor and control coils for industrial, power-generation, repair, and transportation equipment. America’s oldest independent electric motor coil manufacturer, it draws on more than a century of winding data, patterns, and tooling—much of it developed through longstanding service to U.S. Steel mills—to make both replacement coils and custom designs. Its 20,000-square-foot Pittsburgh plant is complemented by a 15,000-square-foot facility in Cranberry Township for magnet-wire manufacturing and distribution.PITTSBURGH, PA
Mitsubishi Electric Automotive America, IncMitsubishi Electric Automotive America, Inc. is the U.S. affiliate of Mitsubishi Electric Corporation that designs, develops, and manufactures electrical and electronic systems and components for mobility providers. Established in 1979 to serve the North American automotive business, it now operates U.S. manufacturing facilities producing products including alternators and car audio systems. Its work spans automotive, heavy-duty truck, and coach applications.MASON, OH