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. [framing and mounting equipment]
8. mats (framing and mounting equipment)

Anotations

Scope note:

Protective boards or other heavy paper with an opening or openings cut in order to reveal photographs. These typically comprise two pieces, the bottom piece supports the print while the top piece has a window through which the photograph may be viewed. The boards may be hinged together to form a protective folder.