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Keywords: Copper blast furnace Closed hearth Mansfeld type.png Haut fourneau produisant du cuivre de type Mansfeld Conception à creuset fermé blast furnace of Mansfeld type Design with closed hearth 1894 https //archive org/details/lecuivreorigine01weisgoog Le cuivre p 145 Paul Louis Weiss 1867-1945 other versions PD-old-70-1923 Uploaded with UploadWizard Copper blast furnaces |