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3768438
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Patent number 3,768,438
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Issue date Oct 30, 1973
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3322099
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Patent number 3,322,099
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Issue date May 30, 1967
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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3174456
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Patent number 3,174,456
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Issue date Mar 23, 1965
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3089460
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Patent number 3,089,460
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Issue date May 14, 1963
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE