... ,couplins,guides,gear reducer etc. Screw Jack Lifting System configurations screw jacks, bevel gearboxes, flex linking shafts ... self locking 2. Multiple jack system, from pair jacks system to fourteen jacks system 3. Electric driven, manual operated ... , Air dampers, Injection molding machines-head adjustments, Tension testing machines, Packaging machinery, Surface-gringing machines, Theatre stages, ...