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	Virtual Reference Desk Abstract Intellectual Property Network Access to over 27 years of U.S. Patent & Trademark Office patent descriptions of over two million patents. Scanned multipage patent image available for patents from 1987 to present. Go to this Site NOW Subjects for this Item: PATENTS The Virtual Reference Desk http://www.virtualref.com/ Copyright © 1997 Christopher C. Brown Revised: 2/11/01