IPC 2013 : D21B 1/28 : Dressers for mill stones, combined with the mill.

IPC2013 > D > D21 > D21B > D21B 1/00 > D21B 1/28[4] > Dressers for mill stones, combined with the mill.
D SECTION D — TEXTILES; PAPER.
D21 PAPER-MAKING; PRODUCTION OF CELLULOSE.
D21B FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT.
D21B 1/00 Fibrous raw materials or their mechanical treatment (beaters D21D 1/00).
D21B 1/28 · · · · Dressers for mill stones, combined with the mill.