Founded 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.
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Darrah Electric CompanyA third-generation, family-owned business founded in 1960, Darrah Electric Company remains rooted in Cleveland-area manufacturing. It builds custom D.C. power supplies for industrial and OEM customers while drawing on more than a century of combined engineering experience to support demanding power-conversion projects.CHESTERLAND, OH
Foster Transformer CompanyBorn from Arnot Foster’s spare-bedroom enterprise, Foster Transformer Company has been a Cincinnati manufacturer since 1937. Its Northside operation is known for custom transformer work, with in-house tooling that helps the company move quickly on new programs and lower-volume production for equipment makers. Foster also supports larger production runs through its facility in Dongguan, China.CINCINNATI, OH
Diamond Electric Mfg. CorpDiamond 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.ELEANOR, WV
Staco Energy Products CompanySince manufacturing its first variable transformer in Dayton in 1937, Staco Energy Products Company has built power-quality and voltage-control equipment for critical electrical applications. The Miamisburg, Ohio manufacturer is described as the oldest and largest U.S. maker of variable transformers, and it continues to support equipment made as far back as 30 years ago. Staco also provides factory-trained service, including start-up, maintenance and repair support, for both current and legacy systems.MIAMISBURG, OH