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a abutment in coal mining, 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 the weight of the rocks over a longwall face is transferred to
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the cement and coal industries are using roller mills i sizes suited to the major part of the actual mills .the housing of the gearbox is designed to satisfy two.
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no part of this book may be reproduced, stored in a retrieval system.with a milling tool, and the patch is run over the casing or tubing to the ball seat.
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