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. image-making equipment
8. photographic equipment
9. photographic processing equipment

Anotations

Scope note:

Tanks of various size designed for the development of photographic film. These often allow for the exchange of liquids without opening the tank completely and exposing the undeveloped film to light. Historically made of various metals, most recently stainless steel.