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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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Patent number 2,147,161
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Issue date Feb 14, 1939
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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2147162
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Patent number 2,147,162
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Issue date Feb 14, 1939
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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2042478
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Patent number 2,042,478
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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Patent number 1,478,614
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Issue date Dec 25, 1923
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE