Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 139,060 pages of information and 225,328 images on early companies, their products and the people who designed and built them.
Sparking plus and oil filters, of Birmingham
of Watling Street, Dunstable, Beds. (1937)
c.1924 Formerly the Sphinx Manufacturing Co
1937 Manufacturers of sparking plugs and other accessories. 
1939 See Aircraft Industry Suppliers
1946 See AC-Delco Division of General Motors