Drilldown: Patents
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Patents > Inventors :
Bruce J. Penney or
Dan Knierim or
Les Larson or
Linley Gumm
& Filing date:
1960 - 1969
& Cites :
Patent US 3214631A or
Patent US 3293473A or
Patent US 3358159A or
Patent US 3689752A or
Patent US 4048577A
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