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Cromwell Engineering Co
There would appear to be 2 companies of very similar names operating at about the same time:
Engine makers of Chauntry Place and 94 Stoney Stanton Road, Coventry (1912). Later at 133 Foleshill Road, Coventry (1920).
c1907 Company formed in Coventry probably by Frederick Payne
1911 Experimented with producing a few cars
1920 Patent by Cromwell Engineering Co (Coventry) Ltd with F. Payne on lead screw nuts for lathes and similar purposes
1941 At an EGM of the Cromwell Engineering Co (Coventry) Ltd, it was agreed that it should be wound up voluntarily
Machine Tool makers, of 327, Putney Bridge Road, London, S.W.15.
1915 Company established (in Putney)
1922 of 327, Putney Bridge Road, London, S.W.15. Principal: T. Allison. Manufactures. — Gear cutters, jigs, gauges, and gear replacements for motor-cars and motor-cycles.
1945 Company closed