Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,439 pages of information and 230,054 images on early companies, their products and the people who designed and built them.
of Oxford Street, London (1926)
of Mortimer Street, London
The pre-WWI Carl Zeiss operation was taken over by the authorities and the Mill Hill factory sold during the war.
1937 Aeroplane searchlights, beacons etc.