IPC 2013 : D04B 17/02 : by darning.

IPC2013 > D > D04 > D04B > D04B 17/00 > D04B 17/02[1] > by darning.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
Notes[g] D04B 17/00 - D04B 19/00: Repairing or unravelling knitted fabrics
D SECTION D — TEXTILES; PAPER.
D04 BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS.
D04B KNITTING.
D04B 17/00 Repairing knitted fabrics by knitting operations.
D04B 17/02 · by darning.