D
SECTION D — TEXTILES; PAPER
  
PAPER
 D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
 D21B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

 D21C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

 D21D
TREATMENT OF THE DIGESTED MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE; PROCESSES FOR ADDING SUBSTANCES TO THE FORMED WEB ON THE PAPER-MAKING MACHINE

 D21F
PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

 D21G
CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H)

 D21H
CARDBOARD; PAPER; THEIR MANUFACTURE NOT COVERED BY SUBCLASS D21F

 D21J
FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes B27N)