Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. sound device components

Anotations

Scope note:

Flat metal discs, shaped like phonograph records, which have pins partially punched out of them and bent at right angles. They are used in disc-playing music boxes which became popular from the late 19th century.