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	Virtual Reference Desk Abstract U.S. Patent Citation Database From the Community of Science. This is a fully searchable bibliographic file containing all of the approximately 1.7 million U.S. patents issued since 1975. Updated weekly. 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