CPC Subgroup
B21D 15/04 transversely, e.g. helically
Full Title
Corrugating tubes (wrinkle-bending using mandrels or the like B21D9/14) > transversely, e.g. helically
2 direct subcodes
Child Classifications
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- B21D 15/06 annularly
- B21D 15/10 by applying fluid pressure