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 21 Centrifuges;incl centrifugal dryers,filtering/purifying machinery...for liquids or gases 84 21 32 Catalytic converters or particulate filters, wheter or not combined, for purifying or Commodity Code Description 84 21 32 00 Catalytic converters or particulate filters, wheter or not combined, for purifying or