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pillar-and-breast system |
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pillar-and-breast system [′pil·ər ən ′brest ‚sis·təm]
(mining engineering) A system of coal mining in which the working places are rectangular rooms usually five or ten times as long as they are broad, opened on the upper side of the gangway. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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