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 Commodity Code Description 84 73 21 - - Of the electronic calculating machines of subheading 8470.10, 8470.21 or 8470.29 84 73 29 - - Other 84 73 30 - Parts and accessories of the machines of heading 84.71 84 73 40 - Parts and accessories of the machines of heading 84.72 84 73 50 - Parts and accessories equally suitable for use with the machines of two or more of the headings 84.70 to 84.72