US91862A Improved flux for smelting ores of gold, silver ...
US91862A US91862DA US91862A US 91862 A US91862 A US 91862A US 91862D A US91862D A US 91862DA US 91862 A US91862 A US 91862A Authority US United States Prior art keywords flux metals silver gold ore Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.