A SURVEY OF STUDY ON THE REDUCE VIBRATION OF THE HIGH-HANDLED CHAIN SAWS THE LOADING FORCE ANALYSIS OF THE LEANING WEAR OF SAW CHINA LINKS AND THE METHODS FOR SOLUTION Transmission Path of High Handle Power Chain Saw Machine Vibration Produced in China CUTTING-RATE MEASUREMENT OF SAW-CHAINS THROUGH NEW TESTING METHOD Lumbar Spine Subjected Stress Characteristic for Operators Using Chain Saw in Forest Harvesting and Finite Element Analysis