Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by process]
7. data processing equipment
8. computer equipment
9. peripherals (computer)
10. input devices

Anotations

Scope note:

Devices consisting of a vertically mounted shaft that can be pushed in any direction; used for generating signals that can cause the cursor or some other symbol to be moved rapidly about on a display screen.