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3555604
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Patent number 3,555,604
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Issue date Jan 19, 1971
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3456044
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Patent number 3,456,044
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Issue date Jul 15, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3274317
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Patent number 3,274,317
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Issue date Sep 20, 1966
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL