CPC Subgroup
B21G 7/06 of undulated hairpins
Full Title
Making pins of U-like shape or split-pins (of paper fasteners or staples B21D53/46, B21F45/16) > of U-like shape > of hairpins > of undulated hairpins
B21G 7/06 Making pins of U-like shape or split-pins (of paper fasteners or staples B21D53/46, B21F45/16) > of U-like shape > of hairpins > of undulated hairpins