IN THE MORNING EMPLOYEE LIFTED TWO HEAVY OBJECTSWITH THE HELP OF ANOTHER EMPLOYEE: A COMPRESSED GAS CYLINDER & A 225LB CABLE HOOK ATTACHMENT FORTHE D-9 DOZER. HE DID NOT NOTICE ANY PROBLEMS WH EN HE MADE THE LIFTS BUT ABOUT NOON HIS BACK WASSORE AND BY THE NEXT MORNING HE HAD DIFFICULTY GETTING OUT OF BED TO COME TO WORK. HE WAS SENT TO DOCTOR NOV. 1, 2000.