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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 the sides, which act as abutments of the arch ...
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Why is it that individual by Robert H. Why is it that individual lines to each tap are run from the manifold. It seems that this would promote water sitting in lines ...
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Health and Safety Executive Rail track and associated equipment for use underground in mines Guidance on selection, installation and maintenance
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