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What are the defects of the elevator rails and connectors?
Hits Update:2017-10-23 15:58:20 Author:28zhaoshang.com.cn
What are the defects of the elevator rails and connectors? - HollowElevator guide rail

Elevator guide railAnd the connecting piece have cracks, scars, burrs and other defects are not allowed, not allowed to have galvanized layer of skin, tumor and shedding phenomenon, the concave black pockmark per meter length does not exceed 5, and the total area of not more than 1cm2.

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