Founded in 1983 by Geoff Turnbull, 66, this County Durham engineering firm now sells to more than 50 countries. It makes exhaust control systems and devices to transfer petrochemicals safely, and customers include JCB, Shell, Exxon Mobil, Scania, Volvo and John Deere. New European emissions legislation helped boost overseas sales to £14.8m in 2011.
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