Drilldown: Patents
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Patents > Inventors :
Dan Knierim or
George Frye or
Richard A. Jackson
& Filing date:
December 2001
& Grant date:
2003
& Cites :
Patent US 3214631A or
Patent US 3293474A or
Patent US 3689752A or
Patent US 4048577A or
Patent US 4255003A
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