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. aerophones
8. lip-vibrated aerophones
9. [lip-vibrated aerophones with conical bore]
10. [lip-vibrated aerophones with conical bore: natural]

Anotations

Scope note:

Lip-vibrated aerophones furnished with curved sliding crooks called inventions, inserted prior to play in the center of the body between the circular portions of the tube, making it possible to change pitch without changing the length of the tube.