of 26 Langham Street, London, W1. Telephone: Mayfair 6178. Cables: "Oravox, Wesdo, London"
- 1929 British Industries Fair Advert for 'all-British Oravox Deaf-aids'. Manufacturers of Hearing Aids. A complete range of British-made Hearing Aids of all types, including the new Oravox Patented Aid which is particularly suitable in cases of deafness caused through middle ear trouble. (Scientific Section - Stand No. O.16) 
Sources of Information
- 1929 British Industries Fair Advert 126 and p129