Bristol Centaurus
Bristol Siddeley BE.10 Olympus Rolls Royce Olympus
Armstong Siddeley Viper Bristol Siddeley Viper Rolls Royce Viper
Bristol BE.26 Orpheus
General Electric T58 - de Havilland Gnome
Bristol Siddeley BE.53 Pegasus  -  Rolls-Royce Pegasus

Bristol was originally formed in 1910 to produce aircraft and entered the aircraft engine business in 1920. The aircraft engine business quickly became the focus of the company, although Bristol developed important aircraft until it became part of British Aircraft Corp. in 1960.
Bristol's engine business created a string of successful piston and jet engines until acquired by Rolls-Royce in 1966.

History

1910: The British and Colonial Aeroplane Co. is formed to manufacture aircraft.
1920: The company changes its name to the Bristol Aeroplane Co. and purchases the aircraft engine assets of the failed Cosmos Engineering. With this acquisition, Bristol acquires the Jupiter engine...one of the premier engines of the 1920s.

1945: Bristol enters the jet age with a turboprop, the Theseus of 1945.

1956: Bristol becomes two separate companies...Bristol Aircraft and Bristol Aero-Engines.

1959: The Ministry of Supply forces aircraft suppliers to merge in order to compete on the TSR.2 contract. Bristol Aero-Engines merges with Armstrong Siddeley to form Bristol Siddeley Engines Ltd.

1960: Bristol Aircraft (along with English Electric and Vickers) form the British Aircraft Corp (BAC).

1961: Bristol Siddeley acquires de Havilland Engines and Blackburn Engines (Blackburn Aircraft joins Hawker Siddeley).

1966: Bristol Siddeley is purchased by Rolls-Royce.