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; PARTS THEREOF 84 55 METAL-ROLLING MILLS AND ROLLS THEREFOR. Commodity Code Description 84 55 10 TUBE MILLS 84 55 21 HOT OR COMBINATION HOT AND COLD - ROLLING MILLS 84 55 22 COLD - ROLLING MILLS 84 55 30 ROLLS FOR ROLLING MILLS 84 55 90 OTHER PARTS FOR METAL-ROLLING MILLS