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. [joints and joint components]
7. joints (connections)
8. [joints by material joined]
9. metal joints
10. metal seams

Anotations

Scope note:

Sheet metal seams having a bottom plate with a turned edge that is inserted inside the side plate; the seam may be secured by welding, soldering, or riveting at the overlapping joint. For bottom seams having the bottom plate with a turned edge that overlaps the side plate rather than being inserted inside it, use "lap bottom seams."