DIFF Subgroup
B21D 15/04 transversely, e.g. helically
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Corrugating tubes > transversely, e.g. helically
CPC:
Corrugating tubes (wrinkle-bending using mandrels or the like B21D9/14) > transversely, e.g. helically
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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