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ore crusher and standards supporting quotes

ore crusher and standards supporting quotes

Ore CrusherAndStandards Supporting Quotes. 2016-12-20abutment in coal mining, 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway and 2 the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...

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