DIFF Subgroup
B21K 1/52 double-ended, e.g. with heads on both ends (forming heads B21K1/46)
Introduced: September 1968
Title
Titles differ between systems:
IPC: double-ended, e.g. with heads on both ends
CPC: double-ended, e.g. with heads on both ends (forming heads B21K1/46)
Full Title
Full titles differ between systems:
IPC:
Making machine elements > bolts, studs, or the like > double-ended, e.g. with heads on both ends
CPC:
Making machine elements > bolts, studs, or the like (making screw-thread B21K1/56; making U-bolts B21K1/74) > double-ended, e.g. with heads on both ends (forming heads B21K1/46)
No child classifications to compare. This is a leaf node in both IPC and CPC.