DIFF Subgroup
B21D 51/12 objects with corrugated walls
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Making hollow objects > characterised by the structure of the objects > objects with corrugated walls
CPC:
Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the structure of the objects > objects with corrugated walls
No child classifications to compare. This is a leaf node in both IPC and CPC.