pillar-and-breast system
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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