Founded in 1919 and briefly part of Rolls-Royce, this company originally made electric switchgears for coal mines. As the coal industry declined, the Sheffield firm diversified, and it now makes switchgears for the oil and gas industry, industrial processes and rail customers. Recent projects include designing a ring main to control unmanned wellheads for the Abu Dhabi National Oil Company and developing technology for offshore oil platforms in Indonesia. Strong demand in the Middle East helped exports to £9.6m last year. Stephen Clarke, 55, is managing director.
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