Drilldown: Patents
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Patents > Inventors :
Cornelis Teunis Veenendaal or
Linley Gumm or
Phil Crosby
& Filing date:
July 25, 1989
& Grant date:
March 20, 1990
& Cites :
Patent US 3293474A or
Patent US 3629731A or
Patent US 3725792A
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