DIFF Subgroup
B21K 3/02 cylinder heads
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Making engine or like machine parts not covered by; Making propellers or the like > cylinder heads
CPC:
Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like > cylinder heads
No child classifications to compare. This is a leaf node in both IPC and CPC.