TUNNELING MACHINES AND PARTS THEREOF; ASPHALT AND CONCRETE BREAKERS; ROCK DRILLS; ROCK DRILL CHUCKS AND RIGS; CENTRIFUGAL, PISTON AND MEMBRANE PUMPS, AIR AND GAS COMPRESSORS AND AFTER AND INTERSTAGE COOLERS THEREFOR; MINE HAULING GEARS; MINE AND SCRAPER CONVEYORS; HOISTS; PISTONS FOR ROCK DRILLS AND COMPRESSORS; SHOVEL LOADING MACHINES; SILENCERS FOR MOTORS, FEEDING APPARATUS FOR ROCK DRILLS; WRENCHES; ELECTRICAL, HYDRAULIC, PNEUMATIC AND GAS DRIVEN IMPACT TOOLS; GRINDING MACHINES; SCREW DRIV...