LIMITED ACCESS. I/W WAS LIFTING APPR. 70 LB. OF SLACK CHAIN WITH BOTH HANDS, SUPPORTED BY (2) COME-A-LONGS, WHEN CHAIN SLIPPED OVER SPROCKET TEETH CRUSHING ENDS OF 3rd AND 4TH FINGERS ON L. HAND AND END OF 3RD FINGER ON R. HAND. I/W REMOVED FINGERS FROM PINNED POSITION.