Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for extent]
7. timepieces
8. [timepieces by form]
9. watches

Anotations

Scope note:

Timepieces in which a quartz crystal is employed as a tiny tuning fork that maintains a specific vibration by means of an electrical current, which is then translated into regular electric pulses, one per second.