Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,403 pages of information and 211,619 images on early companies, their products and the people who designed and built them.
of 3 Albemarle Street, Clerkenwell, EC1 (1937)
1924 Private company.
1937 Gun mountings, ground equipment, searchlight mountings. "Opperman" Reduction Worm Gears. 
WWII Manufactured parts for the De Havilland Mosquito.
1961 Manufacture a wide range of spur, worm and helical gear units embodying any make or type of electric motor. 
1968 Because of broadening range of business the company name was changed to Opperman Holdings