A DRILLER WAS ATTEMPTING TO REMOVE THE DRILL HAMMER WITH A HYDRAULIC CHAIN WRENCH. WHEN PRESSUREWAS APPLIED TO LOOSEN THE HAMMER, THE NUT FLEW OFF AND STRUCK THE DRILLER ON THE EAR & MASTOID BONE. HIS EAR WAS LACERATED AND BRUISED ON THE MASTOID. THE LACERATION WAS SUTURED WITH THREE SUTURES.