DIFF Subgroup
F16J 9/04 Helical rings
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Piston-rings, seats therefor; Ring sealings of similar construction in general > Helical rings
CPC:
Piston-rings , seats therefor; Ring sealings of similar construction (other sealings between pistons and cylinders F16J3/06, F16J15/16 ; tools for mounting or removing piston-rings or the like B25B; piston sealing arrangements on brake master cylinders B60T11/236 ) > Helical rings
No child classifications to compare. This is a leaf node in both IPC and CPC.