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. [fastening and adjusting equipment]

Anotations

Scope note:

Mechanisms that contain bars or wheels with inclined teeth in which pawls are dropped, so motion is imparted, and thus motion can be governed in one direction by hand tools such as wrenches or screwdrivers.