Rock Crusher History
Apr 16, history tells us, it was in , the first us patent was issued on a rock crushing machine. it covered a device which, in a crude way, incorporated the drop hammer principle later used in the famous stamp mill, whose history is so intimately linked with that of the golden age of mining. in , another patent was issued, which comprised a wooden box containing a cylindrical drum apparently of.Apr 16, many small process plants consisted of one crusher, either jaw or gyratory rock crushers, one elevator and one screen. recrushing, if done, was taken care of by the same machine handling the primary break. the single crusher, when of the gyratory type, might be any size from the no. 2 (6″ opening) to the no. 6 with 12-in..