Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Sound Devices (hierarchy name)
5. sound devices (equipment)
6. [sound devices by acoustical characteristics]
7. idiophones
8. friction idiophones

Anotations

Scope note:

Bowed friction idiophones, consisting of a circular flat wood resonator with a set of nails or iron pins of varying heights driven into its sides, which were sounded by being rubbed with a rosined bow. Sympathetic strings were added to some models.