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3018519
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Patent number 3,018,519
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Issue date Jan 30, 1962
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2968821
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Patent number 2,968,821
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Issue date Jan 24, 1961
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL