DIFF Subgroup
F24B 1/1885 Full Title
Stoves or ranges > Stoves with open fires, e.g. fireplaces > with air-handling means, heat exchange means, or additional provisions for convection heating (with additional provisions for heating water F24B1/183; component parts or accessories having air-handling means, heat exchange means, or additional provisions for convection heating F24B1/191); Controlling combustion > characterised by use of heat exchange means (condition responsive controls for regulating combustion F24B1/187)
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.