We're professional in manufacturing and selling Electromechanical Products, SAJ serials pinion and cone progressive safety device is the most important safety device in the pin and rack builder's hoist, which can prevent the cage running over speed, and effectively reduce the cage dropping accident. The products has passed through the evalution presided by the Ministry of construction in 1989. The specialists at the meeting made a high appraisal of reasonable compact structure, stable action ...