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Ribbed fastener
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Patent number 7,438,513
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Issue date Oct 21, 2008
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Phillips Screw Company
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Arnold R. Craven
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Recessed head fastener and driver systems
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Patent number 6,601,482
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Issue date Aug 5, 2003
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Phillips Screw Company
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Barry J. Hughes
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Multiple use screw with tapered threads
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Patent number 5,704,750
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Issue date Jan 6, 1998
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Ford Global Technologies, Inc.
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Christopher James Bartos
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...