Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THERE OF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORD ERS 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. 84 55 10 84 55 10 00 Commodity Code Description 84 55 10 00 00 - Tube mills 84 55 21 00 00 -- Hot or combination hot and cold 84 55 22 00 00 -- Cold 84 55 30 00 00 - Rolls for rolling mills 84 55 90 00 00 - Other parts