Making serpentine-shaped articles by bending essentially in one plane

Bending not restricted to forms of material mentioned in only one of groups , ,; Bending not provided for in groups; Twisting > Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form > Making serpentine-shaped articles by bending essentially in one plane

Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00 (corrugating or bending into wave form B21D13/00, B21D15/00; flanging B21D19/00); Twisting > Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form (making helically seamed tubing B21C37/12) > Making serpentine-shaped articles by bending essentially in one plane