Drilldown: Patents
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Patents > Inventors :
Bruce Hofer or
Bruce J. Penney or
John Addis or
Linley Gumm or
Richard A. Jackson
& Filing date:
1972
& Cites :
Patent GB 460562A or
Patent US 3293474A or
Patent US 3331983A or
Patent US 3413513A or
Patent US 3426237A or
Patent US 4255003A
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