Patent classifications
C
CHEMISTRY; METALLURGY
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C21
METALLURGY OF IRON
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C21C
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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7/00
Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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C21C7/0025
Adding carbon material
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