In moving stairs {escalator}|, separate stairs ride on two bottom wheels in a track and two top wheels in another track. The parallel tracks slope to keep stair level. At ends, a comb scoops out anything on stairs. Electric motor at stair tops connects by chain to chairs. Rubber belts loop over handrails.
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7-Machine-Kinds-Electromechanical
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Date Modified: 2022.0224