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. [equipment for transmitting and reproducing sound]
8. [sound communication tools and equipment]
9. [sound communication devices]

Anotations

Scope note:

Trumpets, usually historic, that were used to amplify the voice, particularly aboard ships during the 19th century. They were used specifically for communication between ships, or to issue orders to the crew.