Patent classifications
C
CHEMISTRY; METALLURGY
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C22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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C22B
PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
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7/00
Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof;; Methods of a general interest or applied to the winning of more than two metals
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