Nothing is presently known about this firm, as we have only seen one to date. A Mr. G. Kustel resident in Dayton, Nevada obtained a U.S. patent in 1865 for an ore-concentrating table and a man by the same name, then resident in San Francisco, shared a U.S. patent with a Mr. F.W. Smith in 1872 for an ore roasting method. The only known bar from this assayer is rough and very crude.