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 21 Centrifuges, including centrifugal dryers; filtering or purifying machinery and 84 21 32 Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines Commodity Code Description 84 21 32 00 Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines