Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,478 pages of information and 233,901 images on early companies, their products and the people who designed and built them.


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Makers of control valves, including chokes for oil/gas wells.

1967 company founded by Edward Singleton, who had had 18 years experience with a British/American control valve company

1971 George Kent acquired Introl which remained an autonomous company in the Group

1974 the Kent Group was acquired by Brown, Boveri and Co of Switzerland

1985 Brown Boveri was merged with ASEA to form ABB

2000 ABB transferred Introl from the Kent Group to the Vetco division of ABB specialising in sub-sea wellheads and associated equipment.

2005 Introl was purchased from Vetco by Koso of Japan

See Also


Sources of Information

  • History of KosoKent Introl [1]