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
1937 Maker of RGD wireless receivers
c1949 Manufactured public address sound equipment at Bridgnorth which was sold by Automatic Telephone and Electric Co
1953 the company had a high reputation for its radio and TV products but the new parent company had no wish to enter the domestic appliances business so disposed of this business; the commercial equipment activity was transferred to the new subsidiary at Bridgnorth, A. T. and E. (Bridgnorth)
1953 Manufacturer of TV sets 
By 1960 Radio Gramophone Development Company Ltd had registered office at Romford
1970 The company had been wound up