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2975486
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Patent number 2,975,486
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Issue date Mar 21, 1961
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2327814
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Patent number 2,327,814
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Issue date Aug 24, 1943
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL