37 Maintenance, rebuilding, repair and remanufacturing services for machinery equipment for use in extruding plastic material, namely, screw type extruders, custom extruders, table top extruders, twin feed extruders, and bulk feed extruders; maintenance, rebuilding, repair and remanufacturing services for extruders, namely, screw type extruders, custom extruders, table top extruders, twin feed extruders, and bulk feed extruders; maintenance, rebuilding, repair and remanufacturing services for machine parts for screw type extruders, custom extruders, table top extruders, twin feed extruders, and bulk feed extruders, namely, packers, feed screws, liners, screws, jacketed barrels, and barrels; rebuilding, repair and remanufacturing of production line equipment for extruding plastic material, namely, dies, custom extrusion dies, flow control dies, forming dies, sheet and film dies, feeders, bulk feeders, twin shaft feeders, mixers, twin shaft mixers, cutters, rotary cutters, guillotine cutters, fly knife cutters, and controls for extruders; maintenance, rebuilding, repair and remanufacturing services for machines for processing plastics; all of the foregoing services provided in the field of extrusion processes performed at temperatures equal to, above, or below the recrystallization temperature of the material being extruded