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Donald N. Ruff Jr.
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Sylvania, OH, US
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last 30 patents
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Patent Grant
Unitized polytetrafluoroethylene radial lip seal
Patent number
5,209,499
Issue date
May 11, 1993
Mather Seal Company
Donald N. Ruff
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...