Full copies of the original patent documents can be obtained from: The British Library, 96 Euston Road, London NW1 2DB, UK. US Patent and Trademark Office, 600 Dulany Street, Madison East, Concourse Level, Alexandria, VA 22314, USA. The Japanese Patent Office, 3-4-3 Kasumigaseki, Chiyoda-ku, Tokyo 100-8915, Japan.
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