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Copies of patents, which contain fuller details and addresses of inventors,
can be obtained from science reference libraries around Britain. For the
details of free public access and purchase price, contact the British Patent
Office at Concept House, Cardiff Road, Newport, Gwent NP9 1RH (Tel: 0633
813535) or the Science Reference and information Service, 25 Southampton
Buildings, London WC₂A 1AY (Tel: 071 323 7919).