Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THERE OF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORD ERS AND REPRODUCERS, AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 66 Parts and accessories suitable for use solely or principally with the machines o 84 66 10 84 66 10 00 Commodity Code Description 84 66 10 00 00 - Tool holders and self-opening dieheads 84 66 20 00 00 - Work holders 84 66 30 00 00 - Dividing heads and other special attachments for machine-tools 84 66 91 00 00 -- For machines of heading 84.64 84 66 92 00 00 -- For machines of heading 84.65 84 66 93 00 00 -- For machines of headings 84.56 to 84.61 84 66 94 00 00 -- For machines of heading 84.62 or 84.63