hard-coal plough

hard-coal plough

[′härd¦kōl ‚plau̇]
(mining engineering)
A plough-type cutter-loader consisting of rigid or swiveling kerfing bits which precut the coal in hard-coal seams.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.