23 CERAMIC PARTS, METALLIZED OR NONMETALLIZED, FOR METAL WIRE DRAWING AND CABLING MACHINES, FOR METAL WORKING MACHINES, FOR PAPER MACHINES, FOR PUMPS, FOR WEAR PARTS ON MILLS AND SEPARATORS-NAMELY, BEARINGS, LININGS, GRINDING PLATES AND SURFACES, GRINDING BALLS, PULVERIZER HAMMER OR IMPACT MEMBERS, ROTOR SHAFTS, CYLINDERS, PISTONS, VALVE SEATS, AND OTHER WEAR PARTS ON ACID PUMPS, FOR TEXTILE MACHINES, THREAD GUIDES AND CUTTING TOOL INSERTS MADE OF CERAMIC