Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,390 pages of information and 211,458 images on early companies, their products and the people who designed and built them.
of Filton, Bristol and Coventry. Makers of aero-engines
1961 Listed as designers and manufacturers of aircraft piston engines, gas turbine engines, and propeller turbine engines; industrial and marine and gas turbine engines; industrial, marine and rail traction diesel engines; motor cars; gas bearing compressors; beaver ball screws, ball ways and ball splines, and general engineering products. 25,000 employees. 
1960 The aircraft businesses of Blackburn and de Havilland became part of Hawker Siddeley.
1961 Employed 25,000 persons. Works at Filton and one subsidiary.
1966 The company was taken over by Rolls-Royce