ELECTRIC-DRIVEN LONGWALL COAL CUTTER

ELECTRIC-DRIVEN LONGWALL COAL CUTTER AT WORK IN AN ENGLISH COLLIERY. By the Jeffrey Mfg. Co. 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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ELECTRIC-DRIVEN LONGWALL COAL CUTTER AT WORK IN AN ENGLISH COLLIERY. By the Jeffrey Mfg. Co. 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