Elevator 55
Elevator 55 : Uses of Elevators: (13) Rack-And-Pinion Lift: Rack-and-pinion lifts are powered by a motor driving a pinion gear. Because they can be installed on a building or structure's exterior and there is no machine room or hoistway required, they are the most used type of lift for buildings under construction (to move materials and tools up and down)
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