E21C27/00—Machines which completely free the mineral from the seam
E21C27/20—Mineral freed by means not involving slitting
E21C27/22—Mineral freed by means not involving slitting by rotary drills with breaking-down means, e.g. wedge-shaped drills, i.e. the rotary axis of the tool carrier being substantially perpendicular to the working face, e.g. MARIETTA-type
Méthode de travail pour le traitement de ferrailles sur un chantier de recyclage de ferrailles et presse-cisaille ou presse ou cisaille utilisée pour cette méthode