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Ype Stone Hammer Crusher

Cp Type Hammer Crusher . New type hammer crusher machine Glossary of Mining Terms rocksandminerals Abutment 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

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