DIFF Subgroup
F27B 9/062 Full Title
Furnaces through which the charge is moved mechanically, e.g. of tunnel type (rotary-drum furnaces with means for agitating or moving the charge F27B7/14); Similar furnaces in which the charge moves by gravity > heated without contact between combustion gases and charge; electrically heated
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.