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What material is good for the pulley in the sliding door?

The sliding door originated in China and spread to North Korea and Japan through Chinese culture. Literally: push the door to pull; from the material: wood, metal, organic, inorganic materials (such as

07-03

2020

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Copyright 2020 Crowns Industry Limited. | All Rights Reserved Provide technology: Honglan Technology 粤ICP备18113101号-1