Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THEREOF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORDERS AND REPRODUCERS AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 Nuclear reactors, boilers, machinery and mechanical appliances; partsthereof 84 57 MACHINING CENTRES, UNIT CONSTRUCTION MACHINES, ETC, FOR WORKING METAL Commodity Code Description 84 57 10 Machining centers 84 57 20 Unit construction machines (single stations) 84 57 30 Multi-station transfer machines