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 55 Metal-rolling mills and rolls therefor Commodity Code Description 84 55 10 Tube mills 84 55 21 Hot or combination hot and cold 84 55 22 Cold 84 55 30 Rolls for rolling mills 84 55 90 Other parts