http://www.google.com/patents?vid=USPAT104117&id=_xBWAAAAEBAJ&jtp=1
http://www.google.com/patents?vid=USPAT875845&id=azFmAAAAEBAJ&pg=PA7-IA1
http://www.google.com/patents?vid=USPAT875845&id=azFmAAAAEBAJ&pg=PA7-IA1
http://www.google.com/patents?vid=USPAT995600&id=SqlEAAAAEBAJ&pg=PP1#PPP1,M1
http://www.google.com/patents?vid=USPAT1215028&id=mNdKAAAAEBAJ&pg=PP1
http://www.google.com/patents?vid=USPAT1865280&id=lONOAAAAEBAJ&pg=PP1
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