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; filtering/purifying machinery... for liquids or gases 84 21 99 Parts of machinery... for filtering/purifying liquids or gases 84 21 99 00 Parts of machinery... for filtering/purifying liquids or gases Commodity Code Description 84 21 99 00 00 Parts of machinery... for filtering/purifying liquids or gases