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C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
C22B13/00—Obtaining lead
C22B13/06—Refining
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FR606048D1924-12-111925-10-28Perfectionnements apportés au traitement des métaux impurs et des masses métalliques impures en fusion
ExpiredFR606048A
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