Mineral freed by means not involving slitting

Full Title

Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting

Child Classifications

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• E21C 27/22 by rotary drills with breaking-down means, e.g. wedge-shaped drills
• E21C 27/24 by milling means acting on the full working face
• E21C 27/26 by closely adjacent cutter chains acting on the full working face
• E21C 27/28 by percussive drills with breaking-down means, e.g. wedge-shaped tools
• E21C 27/30 by jaws, buckets or scoops that scoop-out the mineral
• E21C 27/32 by adjustable or non-adjustable planing means with or without loading arrangements (by percussed planing means E21C27/46)
• E21C 27/46 by percussed planing means