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3913796
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Patent number 3,913,796
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Issue date Oct 21, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3790136
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Patent number 3,790,136
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Issue date Feb 5, 1974
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3481001
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Patent number 3,481,001
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Issue date Dec 2, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3021561
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Patent number 3,021,561
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Issue date Feb 20, 1962
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL