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3235637
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Patent number 3,235,637
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Issue date Feb 15, 1966
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3172928
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Patent number 3,172,928
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Issue date Mar 9, 1965
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL