E21C MINING OR QUARRYING Subclass indexesCUTTING; SLITTING; DISLODGINGGeneral structure of machines25/00, 27/00Details29/00, 31/00, 35/00Other devices33/00, 37/00, 39/00METHODS OF MINING OR QUARRYING; OPEN-PIT MINING41/00, 45/00; 47/00, 49/00OBTAINING MINERALS FROM UNDERWATER50/00WINNING MATERIALS FROM EXTRATERRESTRIAL SOURCES51/00