IPC 2013 : D21D 1/14 : Beaters with one beater roll and with vertical stuff circulation canal.

IPC2013 > D > D21 > D21D > D21D 1/00 > D21D 1/14[2] > Beaters with one beater roll and with vertical stuff circulation canal.
D SECTION D — TEXTILES; PAPER.
D21 PAPER-MAKING; PRODUCTION OF CELLULOSE.
D21D TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE.
D21D 1/00 Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F).
D21D 1/14 · · Beaters with one beater roll and with vertical stuff circulation canal.