Drilldown: Patents
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Patents > Inventors :
Dan Knierim or
George Frye or
Phil Crosby
& Filing date:
1980 - 1989
& Cites :
Patent GB 460562A or
Patent US 3293473A or
Patent US 3293474A or
Patent US 3629731A or
Patent US 3753170A or
Patent US 4146844A or
Patent US 4255003A
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