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3811627
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Patent number 3,811,627
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Issue date May 21, 1974
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3728143
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Patent number 3,728,143
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Issue date Apr 17, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL