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3387307
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Patent number 3,387,307
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Issue date Jun 11, 1968
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2035778
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Patent number 2,035,778
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Issue date Mar 31, 1936
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL