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3778361
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Patent number 3,778,361
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Issue date Dec 11, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3762976
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Patent number 3,762,976
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Issue date Oct 2, 1973
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B44 - DECORATIVE ARTS
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3581522
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Patent number 3,581,522
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Issue date Jun 1, 1971
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B44 - DECORATIVE ARTS