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On the morning of May 6, a batch of suspended single hydraulic props and Metal Roof Beam were loaded in the third workshop of China Coal Group's intelligent equipment production and manufacturing, and
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
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