Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,179 pages of information and 233,417 images on early companies, their products and the people who designed and built them.
Factories at Wolverhampton and Abergavenny
1928 Share issue for £200k to form the company and acquire two factories. One factory at Wolverhampton, the Stewart Street works of AJS; the other was acquired from Gilwern Manufacturing Co of Abergavenny. Stewart Street was used for producing radio receivers, radiograms and loudspeakers. Abergavenny was used for the production of gramophone motors 
1928 Symphony Gramophone & Radio (Foreign) Limited formed with £200k capital 
1929 Plessey produced the first British-made portable battery radio, the “National” which it supplied to Symphony and Columbia.
1930 Petition for winding up the company by Plessey Co