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Abutment - In coal mining (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along Back - The roof or upper part in any underground mining cavity. . Crusher - A machine for crushing rock or other materials.
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mining. Joy incorporates the best-of-breed shearers roof supports face conveyors stageloaders crushers and mobile belt tail pieces to deliver a complete With the Surface Data Communication Link real-time operational information is .. without stopping the belt or interrupting the flow of coal from the longwall face.
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