US556779A Goldseparating machine Google Patents
US556779A Goldseparating machine Google Patents Goldseparating machine . Download PDF Info Publication number US556779A. US556779A US556779DA US556779A US 556779 A US556779 A US 556779A US 556779D A US556779D A US 556779DA US 556779 A US556779 A US 556779A Authority US United States Prior art keywords gold fan box apron