IPC 2013 : D05B 57/32 : in chain-stitch sewing machines.

IPC2013 > D > D05 > D05B > D05B 57/00 > D05B 57/32[2] > in chain-stitch sewing machines.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
Notes[g] D05B 43/00 - D05B 67/00: Sewing-machine elements for supplying, handling, or treating thread material
D SECTION D — TEXTILES; PAPER.
D05 SEWING; EMBROIDERING; TUFTING.
D05B SEWING (appliances for the tailoring trade A41H; sewing tables A47B 29/00; sewing in bookbinding B42B 2/00; sewing machines modified for knitting D04B 39/08).
D05B 57/00 Loop takers, e.g. loopers, for sewing machines.
D05B 57/32 · · in chain-stitch sewing machines.