CPC Subgroup
B21F 3/02 helically
Full Title
Coiling wire into particular forms > helically
3 direct subcodes
Child Classifications
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- B21F 3/027 with extended ends formed in a special shape, e.g. for clothes-pegs
- B21F 3/04 externally on a mandrel or the like
- B21F 3/06 internally on a hollow form