Counting Scania, BP and the likes of JCB and John Deere as customers, this engineering firm sells its exhaust control systems for diesel engines to more than 50 countries. Increasingly stringent European emissions legislation helped boost exports to £23.4m in 2013. The County Durham firm, founded by Geoff Turnbull, 68, in 1983, also makes valves and seals for safe petrochemical transfer.
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