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US1116355A - Method of mining coal. - Google Patents

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Patent CA1066310A - Method of extracting coal - Google Patents

ABSTRACT OF THE DISCLOSURE Coal is extracted in a longwall working with two subsidiary galleries disposed respectively at the ends of the longwall coal-face. The coal ...

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Water cooling method and structure for traction electric machine

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Paper analyses with emphasis the faults often occurred in traction portion of the miner, i.e. non-traction, one way traction and drop of traction speed, points out ...

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Paper analyses with emphasis the faults often occurred in traction portion of the miner, i.e. non-traction, one way traction and drop of traction speed, points out ...

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A Novel Adjustment Method for Shearer Traction Speed ...

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A method and apparatus for haulage of material in a self-propelled vehicle on a sloped surface by supplementing traction force of the self-propelled vehicle by rope ...

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