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An associated company of Automatic Telephone and Electric Co
1937 Maker of RGD wireless receivers
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