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 suitable for machines of 84.69 to 84.72 84 73 21 Of the electronic calculating machines of subheading 8470.10.00, 8470.21.00 or 8470.29.0 84 73 21 00 Of the electronic calculating machines of subheading 8470.10.00, 8470.21.00 or 8470.29.0 Commodity Code Description 84 73 21 00 000 Of the electronic calculating machines of subheading 8470.10.00, 8470.21.00 or 8470.29.0