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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1/00
Refining of pig-iron; Cast iron
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C21C1/10
Making spheroidal graphite cast-iron
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