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Assembling an excavator. Chair hooked to counterweight to set it up in order to hook it up in place on excavator. Chair not hooked properly, not secured. Chain came loose and hit employee in the mouth.

EMPLOYEE WAS IN THE REPAIR SHOP FABRICATING A CHUTE. HE STOOPED TO PICK UP A PORTABLE GRINDER FROM THE FLOOR AND FELT A PAIN IN HIS BACK. THIS IS AN AGGREVATION OF A BACK CONDITION THAT PREVIO USLY EXISTED.