Reduction gears being machine elements not for land vehicles; Reduction gears, other than for land vehicles; Speed change gears being parts of machines, other than for land vehicles; Transmissions for machines being machine elements not for land vehicles; Machine elements, not for land vehicles, namely, gear housings, axles, bearings and bushings; Parts of non-electric prime movers being engine parts, namely, cam protectors, camshafts, particulate filters