NOTICE:
Recently, the DFB (1400-4400 standard specifications)/300, DJB600/470, DJB800/420, DJB (1000, 1200)/300 metal roof beams independently developed and produced by China Coal Group, of which 4 types of h
Recently, Shandong China Coal Group has received a series of two series (common series and suspension series) produced by China Coal Group Machinery Co., Ltd., and 16 types of mining single hydraulic
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