Subsequent mold handling was mechanical using cranes, hoists and straps. Carnegie installed vastly improved systems of material-handling, like overhead cranes, hoists, charging machines, and buggies. Motors of this type can also be found on overhead cranes and hoists. Lift and dump capacities of hydraulic hooklift hoists typically range from . Wheelchair hoists, lifts or ramps may be customized according to the needs of the driver. Many of the hoists and cranes on the dockside can be seen across the town. Most hoists couple to their loads using a lifting hook. The tall hydraulic hoists have since been demolished. These derricks were later replaced with steam hoists as work progressed. Cargo handling is done by means of a forklift or electric hoists on traveling beams. Some mechanical linear actuators only pull, such as hoists, chain drive and belt drives. Ancient and medieval elevators used drive systems based on hoists or windlasses. These included excessive draft, low armor belts, large turret openings and exposed ammunition hoists. The An-70's cargo hold is serviced by four electrical hoists that facilitate autonomous cargo loading. Turret hoists, voicepipes and electrical leads were protected by armored tubes.