Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,370 pages of information and 230,032 images on early companies, their products and the people who designed and built them.
of West Heath Works, Mill Lane, London, NW6, and of Blackburn-road, West Hampstead, London, N.W.6. (1923).
1923 Named changed from Clews, Petersen and Co to Clews Petersen Piston Ring and Engineering Co
1937 Aircraft engine accessories. "Clupet" Scraper Rings. 
1939 See Aircraft Industry Suppliers