# Relationship history for MSHA mine 0504006

Current hierarchy: **United States Government → U S Bureau Of Reclamation → Borrow Area B**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** United States Government → Borrow Area B; 1980-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Bureau Of Reclamation → Borrow Area B; 1984-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Bureau Of Reclamation; 1984-12-01 to current/open; source msha-controller-operator-history