DIFF Subgroup
F24D 19/1006 Full Title
Details (of water or air heaters F24H9/00; of heat-exchange or heat-transfer apparatus, of general application F28F) > Arrangement or mounting of control or safety devices (only the heater being controlled F24H9/20)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.