DIFF Subgroup
F27B 3/002 Full Title
Hearth-type furnaces, e.g. of reverberatory type (F27B9/00, F27B11/00, F27B13/00, F27B14/00, F27B15/00, F27B21/00 take precedence); Electric arc furnaces
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.