Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,100 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
An Associate company of Automatic Telephone and Electric Co
1934 Became private company. Maker of loud-speaking master stations and substations for office and works intercommunication telephone systems.
1957 Mainly concerned with making telecommunication equipment for use in mines
1961 Manufacturers of mine signalling equipment and telephones. 340 employees.