MACHINES FOR CUTTING OR CRUSHING SURFACE MINERAL; ELECTRICAL AND ELECTRO-HYDRAULIC DRIVES FOR SUCH MACHINES; CONTROL SYSTEMS FOR THE DRIVE OF THE HAULAGE BOX OR RUNNING GEAR OR CUTTING TOOLS OF SUCH MACHINES FOR CUTTING OR CRUSHING SURFACE MINERAL, MAINLY COMPRISING ELECTRIC MOTORS, POWER CONTROLLERS, TEMPERATURE CONTROLLERS, QUANTITY CONTROLLERS, POWER ELECTRONICS, THYRISTORS, COLD CONDUCTORS, TEMPERATURE CONTROLS, PRINTED CIRCUIT BOARDS AND MICROPROCESSORS; SYSTEMS FOR BRAKING SUCH MACHINES...