DIFF Subgroup
B21F 37/04 of washers (B21F37/02 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: of washers
CPC: of washers (B21F37/02 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Manufacture of rings from wire > of washers
CPC:
Manufacture of rings from wire > of washers (B21F37/02 takes precedence)
No child classifications to compare. This is a leaf node in both IPC and CPC.