WHILE SETTING THE ROOF BOLTING MACHINE'S ATRS, EE WAS STRUCK ON THE LEFT SHOULDER BY A PIECE OF DRAW ROCK MEASURING 34"" X 34"" X 3"". EE CONTINUED TO WORK UNTIL 2-29-04. AT THAT TIME HE VISITE D HIS FAMILY PHYSICIAN. EE WAS DIAGNOSED WITH A MUSCLE STRAIN TO HIS LOWER BACK AND IS SCHEDULED FOR PHYSICAL THERAPY.