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3921313
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Patent number 3,921,313
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Issue date Nov 25, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3896202
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Patent number 3,896,202
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Issue date Jul 22, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3863272
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Patent number 3,863,272
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Issue date Feb 4, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3718518
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Patent number 3,718,518
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Issue date Feb 27, 1973
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3676542
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Patent number 3,676,542
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Issue date Jul 11, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3441643
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Patent number 3,441,643
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Issue date Apr 29, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL