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Moving stairs is a mechanical transportation device commonly known as an escalator. It is a continuously moving staircase designed to carry people between different levels of a building or structure. It consists of a motor-driven chain of individual, linked steps that move up or down on tracks while remaining horizontal. The steps rotate in a loop system, guided by tracks inside a truss, _____ _____ _____ ________ ___ ______ ______ ____ ____ ____.
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