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 71 Automatic data-processing machines and units thereof; magnetic or optical readers, machines for transcribing data onto data media in coded form and machines for processing such data, not elsewhere specified or included Commodity Code Description 84 71 30 - Portable automatic data processing machines, weighing not more than 10 kg, consisting of at least a central processing unit, a keyboard and a display 84 71 41 - - Comprising in the same housing at least a central processing unit and an input and output unit, whether or not combined or not combined 84 71 49 - - Other, presented in the form of systems 84 71 50 - Processing units other than those of subheading 8471.41 or 8471.49, whether or not containing in the same housing one or two of the following types of unit: storage units, input units, output units 84 71 60 - Input or output units, whether or not containing storage units in the same housing 84 71 70 - Storage units 84 71 80 - Other units of automatic data processing machines 84 71 90 - Other