E21C27/00—Machines which completely free the mineral from the seam
E21C27/20—Mineral freed by means not involving slitting
E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
E21C27/42—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements combined with scraper or collector box
E—FIXED CONSTRUCTIONS
E21—EARTH OR ROCK DRILLING; MINING
E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F13/00—Transport specially adapted to underground conditions