D
SECTION D — TEXTILES AND PAPER
  
PAPER
 D21
PAPER-MAKING; PRODUCTION OF CELLULOSE
 D21B
FIBROUS RAW MATERIALS AND 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 ON THEM

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

 D21H
CARDBOARD; PAPER; THEIR MANUFACTURE NOT COVERED BY SUB-CLASS D21F

 D21J
FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE