... some Loading&Unloading Machines of over-medium diameter,such as,Tower Crane,Truck crane,and so on.3. Single-Row Crossed Roller Slewing ... bigger diameter,such as,Bucket-Wheel Excavator,wheeled Crane,Shipyard Crane,heavy-duty Truck Crane,and so on. 5.Single-Row Four Point ... example,Slewing Conveyer,Welding Operation Machine,Pint-size&Medium-sized Crane,and so on.6. Single-Row Crossed Roller Slewing Ring ...