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machine parts, namely, roller bearings, bushings, power drills chucks, powder drill bits, connecting rods for machines, motors and engines, couplings, cylinders, piston rings, internal combustion engine pistons and rods, extension bars for power tools, fans for machines and engines, fly-wheels, transmission gears for machines, jack stands for hydraulic jacks, nozzles that are parts of power operated sprayers, printing plates, pulleys, mechanical shaft couplings, wire brushes for use in machines