Roller Chains Used In Coal Mining Industry

2018-1-4abutment - in coal mining, 1 by the action of scraper crossbars attached to powered chainshain pillar - the pillar of coal left to protect the gangway or entry and the parallel airwaysprop - coal mining term for any single post used as roof supportrops may be timber or steel if steel--screwed, yieldable, or hydraulic.

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