EE WAS ASSISTING REG. ROOF BOLTEROP. WHILE STANDING ON TOP OF MACHINE & WAS MOVING FROM BACK OF MACH. TO FRONT ON EACH BOLT INSTALLATION. CONDITIONS WERE SUCH THAT THE OP. COULD NOT REACH THE TOP BECAUSE THE TOP BEING 10' HIGH THAT WOULD NORMALLY HAVE BEEN 5-6 1/2' HIGH. EE WOULD INSERT 6' ROOF BOLT AFTER OP. INSERTED GLUE. WHILE RETREATING TO THE REAR OF THE MACH. THE OP. ACTED QU