DIFF Subgroup
C21B 5/02 Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
Introduced: September 1968
Full Title
Making pig-iron in the blast furnace > Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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