D21Level 2

PAPER

GET/api/v1/systems/patent_cpc/nodes/D21

Official DownloadPublic Domain

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D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS

D21DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE

D21FPAPER-MAKING MACHINES

D21HPULP COMPOSITIONS

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