DIFF Subgroup
F23C 6/042 Full Title
Combustion apparatus characterised by the combination of two or more combustion chambers > in series connection (consuming smoke or fumes in separate combustion apparatus F23G7/06)
F23C 6/042 Combustion apparatus characterised by the combination of two or more combustion chambers > in series connection (consuming smoke or fumes in separate combustion apparatus F23G7/06)