Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by general context]
6. hardware (components)
7. [hardware by form]
8. finish hardware (hardware)
9. [securing devices and securing device components]
10. securing devices
11. locks (securing devices)
12. [locks by location or context]
13. door locks
14. French-door locks

Anotations

Scope note:

Fastenings for French or casement doors that consist of long rods, often hooked, at the top and bottom of the sash and that operate with a handle in the center. These use a round or square bar, distinguished from the half-round bar of a cremorne bolt.