DIFF Subgroup
F02F 3/14 within combustion chambers
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Pistons > having surface coverings > on piston heads > within combustion chambers
CPC:
Pistons > having surface coverings (F02F3/02 takes precedence) > on piston heads > within combustion chambers
No child classifications to compare. This is a leaf node in both IPC and CPC.