23 CARBON AND GRAPHITE MACHINERY PARTS AND STRUCTURAL SHAPES-NAMELY, ROTORS, VANES, BEARINGS, BUSHINGS, SLIDES AND SEATS; AND COMPRESSED POWDERED METAL PARTS AND STRUCTURAL SHAPES-NAMELY, GEARS, CAMS, DOGS, PAWLS, ROTORS, VANES, BEARINGS, BUSHINGS, SLIDES, SEATS, CYLINDERS, AND LINERS