US1366651A - Grinding-mill - Google Patents
US1366651A US33250919A US1366651A US 1366651 A US1366651 A US 1366651A US 33250919 A US33250919 A US 33250919A US 1366651 A US1366651 A US 1366651A Authority US United States Prior art keywords rods grinding drum conical mill Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.