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Sealing fastener
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Patent number 4,749,321
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Issue date Jun 7, 1988
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Elco Industries, Inc.
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Rudolph E. Knohl
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Painted screw and washer assemblies
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Patent number 4,462,730
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Issue date Jul 31, 1984
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Illinois Tool Works Inc.
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Rudolph E. Knohl
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Fastener with a modified thread form
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Patent number 4,334,815
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Issue date Jun 15, 1982
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Illinois Tool Works Inc.
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Rudolph E. Knohl
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...