Machines which completely free the mineral from the seam

Child Classifications

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• E21C 27/01 specially adapted for removing overhanging coal
• E21C 27/02 solely by slitting (rods, drums, for same E21C25/10; saws, discs, wheels E21C25/18; chains, chain guides, for same E21C25/28)
• E21C 27/10 by both slitting and breaking-down
• E21C 27/18 by both slitting and planing
• E21C 27/20 Mineral freed by means not involving slitting