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Method of core removal from molded products
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Patent number 5,262,100
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Issue date Nov 16, 1993
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Advanced Plastics Partnership
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Timothy M. Moore
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Molding core
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Patent number 5,248,552
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Issue date Sep 28, 1993
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Advanced Plastics Partnership
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Timothy M. Moore
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Cover with integral fastening means
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Patent number 4,883,394
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Issue date Nov 28, 1989
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Polyco, Inc.
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Gerbrig W. Van der Woude
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING