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Undercut mold insert
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Patent number 8,529,245
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Issue date Sep 10, 2013
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George Roy Payton
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3743236
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Patent number 3,743,236
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Issue date Jul 3, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2714226
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Patent number 2,714,226
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Issue date Aug 2, 1955
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL