DIFF Subgroup
B21K 1/54 with grooves or notches
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Making machine elements > bolts, studs, or the like > with grooves or notches
CPC:
Making machine elements > bolts, studs, or the like (making screw-thread B21K1/56; making U-bolts B21K1/74) > with grooves or notches
No child classifications to compare. This is a leaf node in both IPC and CPC.