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 66 Parts and accessories for machines of 84.56 to 84.65; tool holders... Commodity Code Description 84 66 10 Tool holders and self-opening dieheads 84 66 20 Work holders 84 66 30 Dividing heads and other special attachments for machine-tools 84 66 91 For machines of heading 84.64 84 66 92 For machines of heading 84.65 84 66 93 For machines of heading 84.56 to 84.61 84 66 94 For machines of heading 84.62 or 84.63