THE INJURED MOVED HIS HEAD OUT FROM UNDER THE CANOPY AT THE DRILLER'S STATION ON THE HELPER'S SIDE OF THE TWIN HEAD BOLT MACHINE TO OBSERVE THE ROOF CONDITIONS ON THE OPERATOR'S SIDE OF THE MA CHINE. AT THAT TIME THE BRASS CAME OUR OF THE CANOPY TUBE ALLOWING THE CANOPY TO SWING AROUND STRIKING HIS HEAD BEHIND HIS RIGHT EAR CAUSING A BRUISE & SWELLING. HE BEGAN MISSING WORK 4/10/02