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 149,270 pages of information and 234,239 images on early companies, their products and the people who designed and built them.


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January 1969.

1963 As part of GKN, Lieut-Colonel Richard Lewis, MD of Birwelco, formed Servotomic which traded as Servowarm and which developed a simple gas-fired central heating system[1]

See Also


Sources of Information

  1. The Times, June 13, 2002