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. bookbinding equipment

Anotations

Scope note:

Thin, U-shaped pieces of metal or wood that are placed between the sewing supports and boards at the back of a text block to temporarily flatten the rounded back so that the foredge may be trimmed or decorated.