Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. People (hierarchy name)
4. people (agents)
5. [people by occupation]
6. [people in engineering, building trades and planning]
7. construction workers

Anotations

Scope note:

Originally and historically, plumbers were people who worked with or cast lead. Subsequently and currently this refers to people who fit or repair the pipes, fittings, and other apparatus relating to a water supply, sanitation systems, or heating or cooling of structures.