... NOSEN offers a powerful,reliable and complete Multiple Worm Gear Screw Jacks for the electromechanical adjustment of linear ... bevel gearboxes,flexible linking shafts,couplings,additional guides,electric motors.* Worm Gear Screw Jack Systems is of heavy duty,self ... mounting bolts.* Manual Operated or Electrical Drive.* Worm Gear Screw Jack Systems Application Industries:Theatre and stage construction ...