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烟台乐森机械设备有限公司

China The resistance of negative pressure ventilation ducts with coated fabric for coal mines does not exceed 800 mm, and one section of the 800 mm duct is spliced. - China Supplier

The resistance of negative pressure ventilation ducts with coated fabric for coal mines does not exceed 800 mm, and one section of the 800 mm duct is spliced.
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