7 MACHINE TOOLS AND PARTS THEREOF; TOOLS, TOOL HOLDERS AND WORKPIECE HOLDERS FOR USE IN MACHINES AND IN MINING EQUIPMENTS AS WELL AS PARTS OF SUCH TOOLS, TOOL HOLDERS AND WORKPIECE HOLDERS; COATED AND UNCOATED PARTS MADE OF CARBIDES AND/OR HARD METALS FOR INDUSTRIAL AND ENGINEERING PURPOSES-NAMELY, ROLLERS, RINGS, JAWS, SLEEVES, PISTONS, PINS, BALLS, RODS, CORES, BOLTS, BUSHINGS, AXLES, CYLINDERS, PLATES, PRESSURE CYLINDERS, CUTTING PLATES, CRUSHING JAWS, HAMMER JAWS, FITTINGS FOR USE IN TOOLING AND PATTERN MAKING, GRINDSTONES, GRINDING RINGS, PESTLES, MORTAR, SLIP RINGS, BEARING RINGS, BEARING BOXES, WEAR RINGS FOR COLD AND HOT ROLLING, MATRICES FOR MOLDING AND SHAPING, VALVE SEAT RINGS, VALVE CONES, PROTECTIVE SLEEVES FOR SHAFTS, SEALING SLEEVES, TREAD ROLLERS, GUIDE ROLLERS