Drilldown: Patents
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Patents > Inventors:
Dan Knierim
& Filing date:
1988
& Grant date:
December 1990
& Cites :
Patent GB 460562A or
Patent US 2922074A or
Patent US 3293473A or
Patent US 3629731A or
Patent US 4255003A or
Patent US 4322688A or
None
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