DIFF Subgroup
F02F 3/12 on piston heads
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Pistons > having surface coverings > on piston heads
CPC:
Pistons > having surface coverings (F02F3/02 takes precedence) > on piston heads
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
Navigate with arrow keys, Enter to open