IPC 2013 : D21D 1/24 : Jordan rolls.

IPC2013 > D > D21 > D21D > D21D 1/00 > D21D 1/24[3] > Jordan rolls.
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 1/24 · · · Jordan rolls.