Industrial machines and machine parts therefor, namely internal combustion engines and parts therefor, namely bearings, bushings, pistons, cylinder liners, wrist pins, valve lifters, valve train push rods, valve train push rod tips, rocker arms, rocker arm inserts, camshafts, camshaft lobes, valve seat inserts, turbine blades, combustion chamber liners, fuel injection nozzles, spark plugs, glow plugs, turbo-chargers, turbo-charger rotors, connecting rods, crank liners; jet engines and parts therefor; rocket engines and parts therefor; including rocket engine nozzles; bearings, bushings, valves, being parts of machines and parts therefor, namely; valve seats; chokes and choke inserts; heat exchangers and parts therefor; namely: radiant tubes and parts therefor; paper making machines and parts therefor, namely: suction box covers, foils and forming boards; dies; guides; rotary internal combustion engines and parts therefor, namely: apex seals; air and gas compressors and parts therefor, namely: ceramic seals and seal faces; sump pumps and centralized pumps and parts therefor; namely: pump sleeves