US3050264A - Sound actuated control system for ball mill ...
US3050264A US827847A US82784759A US3050264A US 3050264 A US3050264 A US 3050264A US 827847 A US827847 A US 827847A US 82784759 A US82784759 A US 82784759A US 3050264 A US3050264 A US 3050264A Authority US United States Prior art keywords mill sound ball mill output control Prior art date Legal status (The legal …
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