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3913828
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Patent number 3,913,828
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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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3703396
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Patent number 3,703,396
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Issue date Nov 21, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3668059
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Patent number 3,668,059
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Issue date Jun 6, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3645829
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Patent number 3,645,829
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Issue date Feb 29, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2992960
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Patent number 2,992,960
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Issue date Jul 18, 1961
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL