Keyboards and mice imported separately are generally classified under 847330 as parts and accessories for ADP machines, rather than under the 8471 input/output subheading. The 8471 input/output subheading typically applies to complete, functional input or output units (such as a standalone monitor or a complete scanner), while individual peripheral accessories fall under 8473.

Subheading 847350 is specifically designed for parts and accessories that are equally suitable for use with machines of two or more of the headings covered (8469–8472). If a component is genuinely interchangeable across those machine types and cannot be identified as principally for one, 847350 is the correct classification. If it is principally designed for ADP machines, 847330 takes precedence.