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 64 Machine-tools for working stone, ceramics, concrete, etc 84 64 20 Grinding or polishing machines Commodity Code Description 84 64 20 00 Grinding or polishing machines