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3663679
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Patent number 3,663,679
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Issue date May 16, 1972
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3608152
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Patent number 3,608,152
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Issue date Sep 28, 1971
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL