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Two-stage oxygen pulping
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Patent number 4,080,248
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Issue date Mar 21, 1978
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Crown Zellerbach Corporation
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Mark Andrew Hannah
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3888727
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Patent number 3,888,727
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Issue date Jun 10, 1975
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3785920
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Patent number 3,785,920
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Issue date Jan 15, 1974
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3773611
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Patent number 3,773,611
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Issue date Nov 20, 1973
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3769152
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Patent number 3,769,152
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Issue date Oct 30, 1973
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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3691008
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Patent number 3,691,008
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Issue date Sep 12, 1972
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE