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Retail outlet: 25 Savile Row, London. Works: Slough
Graham Amplion of 230 Tottenham Court Road, London, W1. Telephone: Museum 9648
Manufacturers of Amplion loudspeakers, Amplion public address equipment and Amplion wireless receivers. A subsidiary of Alfred Graham and Co.
1920 New company established Graham Amplion Ltd (see advert) to manufacture and market Amplion loudspeakers. 
1928 William Harold Lynas was recognised as past MD of the company in flotation of Wireless Pictures Ltd.
1928 New development: Lion loudspeaker.
1929 In association with the inventor, R. M. Hamilton, produced the Amplion Totalisator for race courses.
1930 Exhibited a radio receiver at the National Radio Exhibition at Olympia 
1932 Perhaps formation of Amplion (1932) Ltd?
1939 Graham Amplion Ltd was struck off the register of companies
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Radio Loudspeakers, Reproducers, Pickups, Mains-Units, Battery-Eliminators, Pocket-Voltmeters. (Olympia, Ground Floor, stand No. C.1542) 
1962 Company wound up by the High Court on application of Optical Products Ltd, a supplier.