LOGGING CHAIN BOUND IN TRACK OF D9G TRACTOR INVISIBLE TO OPERATOR WHEN STARTED TRACTOR. BACKED ABOUT 15 FT, CHAIN TIGHTENED, BROKE & HIT OPERATOR ON SIDE OF NOSE (ABOUT 1"" CUT) AND END OF CHIN (ABOUT 1/2"" CUT). FOUR STITCHES IN CUT ON NOSE AND 1 STITCH IN CHIN.