Industrial ceramic components, all constructed wholly or partially of ceramics or similar materials, namely, dies for use with machine tools and being parts of machines for the extrusion of rods and tubing of copper, brass or aluminum; engine parts, namely, cam follower faces, valve guides, valve seats and seatings, valves and valving, plunger pumps and plunger pistons, roller bearings and connecting rods, bearings, cylinder liners and piston caps, all being other than for land vehicles; machine parts, namely, wear and corrosion resistant nozzles, plunger pumps, bearings, valves and cylinder sleeves, used in food-processing, chemical manufacturing and mining applications; machine parts, namely, wear resistant outlets for centrifuges in the nature of hydrocyclones; ball valves, being parts of machines used in the oil industry; machine parts, namely, guide roller conveyors, bearings, valves and valving, plunger pumps and plunger pistons, roller bearings, connecting rods and cylinder sleeves, used in metal working and in drawing of metals; nozzles for power-operated spraying, being parts of machines used in metalworking and in drawing of metals; machine parts, namely, shut-off valves, including shut-off valves being parts of plastics material moulding machines; die parts for use with machine tools, namely, die casting gate and metal casing inserts; dies for use with machine tools, namely, dies for use in tablet presses, dies for use in paper lapping machines, dies for use in powder metal compacting machines, dies for use in cupping and ironing machines, dies for use in extrusion machines; concrete weight roller conveyors; gem lapping machines; industrial ceramic components being parts for pumps, namely, bearings, sleeves, and impellers