IPC 2013 : D05B 15/08 : for lock-stitch work.

IPC2013 > D > D05 > D05B > D05B 15/00 > D05B 15/08[3] > for lock-stitch work.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
Notes[g] D05B 3/00 - D05B 23/00: Special-purpose or automatic sewing apparatus or machines
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 15/00 Machines for sewing leather goods (making pseudo-lock-stitch seams D05B 1/16).
D05B 15/08 · · · for lock-stitch work.