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The working of a lower part of a bed of coal to bring down the upper mass.
The final act of connecting two workings underground.
The meeting of two mine roadways driven to intersect. Also known as thirling.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The punching of holes in slates before fixing on a roof.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.