IPC 2013 : D05B 97/04 : for darning.

IPC2013 > D > D05 > D05B > D05B 97/00 > D05B 97/04[1] > for darning.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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 97/00 Hand sewing processes or apparatus for special work or not otherwise provided for.
D05B 97/04 · for darning.