Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 137,459 pages of information and 221,559 images on early companies, their products and the people who designed and built them.
of Relief Works, Grove Street, Winson Green, Birmingham
1937 Manufacturers of small tools, cutters, gauges etc. "B.T.G." Gauges, Jigs, Machine Tools etc. 
1939 See Aircraft Industry Suppliers