DIFF Subgroup
F16J 3/041 Full Title
Diaphragms; Bellows; Bellows pistons (connection of valves to inflatable elastic bodies B60C29/00; bellows or the like used in instruments G12B1/04; diaphragms for electromechanical transducers H04R7/00) > Bellows
Of 4 combined children, 0 exist in both systems.
4 codes are CPC-only extensions.