DIFF Subgroup
B21D 15/03 by applying fluid pressure
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Corrugating tubes > longitudinally > by applying fluid pressure
CPC:
Corrugating tubes (wrinkle-bending using mandrels or the like B21D9/14) > longitudinally > by applying fluid pressure
No child classifications to compare. This is a leaf node in both IPC and CPC.