Keywords: Pierre Manhès.jpg low quality Pierre Manhès 1841 “ 1906 industriel et ingénieur français inventeur du procédé Manhès-David utilisé pour l'affinage du cuivre Pierre Manhès 1841 “ 1906 French industrial and engineer inventor of the Manhès-David process used for copper refining < 1900 https //www myheritage com/FP/genealogy-search-ppc php type action person siteId 178575511 indId 2010457 origin profile myheritage com Pierre Manhès 1841 “ 1906 other versions Custom license marker 2016 06 17 PD-old Manhès-David converters Inventors from France Engineers from France |