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3395424
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Patent number 3,395,424
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Issue date Aug 6, 1968
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3020591
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Patent number 3,020,591
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Issue date Feb 13, 1962
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL