In March, 2006, Wheelock, Inc was acquired by Cooper Menvier of the United Kingdom, a division of Cooper Industries.
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The company is the successor to both Arrow-Hart & Hegeman and Eagle Electric, both of which Cooper Industries had acquired.
In 1988, IMO Delaval sold the Enterprise aftermarket services to Cooper Industries which, in turn, spun off its oil and gas related holdings to Cameron Corporation, previously known as Cooper Cameron Corporation, Cameron International Process and Compression Systems is the current original equipment manufacturer for Enterprise engines.
In 2008, MTL Instruments was purchased by Cooper Industries of Houston, Texas, under that company's Crouse-Hinds division.