Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 146,034 pages of information and 231,556 images on early companies, their products and the people who designed and built them.
of Paragon Works, Ruvigny Gardens, Putney, London, SW1. Telephone: Putney 3262. Consulting Rooms at 22/24 Kensington Church Street, London, W8. Telephone: Western 8750 and Mansfield Chambers 17 St Ann's Square, Manchester.
1947 British Industries Fair Advert as Manufacturers of the single unit "Osray" battery powered deaf aid. Hearing Aids, Church, Cinema and Theatre Installations for the Deaf. (Scientific and Optical Section)