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 73 Parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 8470 to 8472 84 73 21 - - Of the electronic calculating machines of subheading 8470.10, 8470.21 or 8470.29 Commodity Code Description 84 73 21 00 - - Of the electronic calculating machines of subheading 8470.10, 8470.21 or 8470.29