UNDERCUTTING or KERVING COAL

UNDERCUTTING or KERVING COAL BY HAND, THE OLD METHOD NOW BEING SUPERSEDED BY THE USE OF COAL-CUTTING MACHINES. from the Article APPLICATIONS OF ELECTRICITY IN THE COLLIERIES OF GREAT BRITAIN. By Sydney F. Walker. from The Engineering Magazine Devoted to Industrial Progress Volume XIX 1900 The Engineering Magazine Co

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UNDERCUTTING or KERVING COAL BY HAND, THE OLD METHOD NOW BEING SUPERSEDED BY THE USE OF COAL-CUTTING MACHINES. from the Article APPLICATIONS OF ELECTRICITY IN THE COLLIERIES OF GREAT BRITAIN. By Sydney F. Walker. from The Engineering Magazine Devoted to Industrial Progress Volume XIX 1900 The Engineering Magazine Co