# Relationship history for MSHA mine 1202420

Current hierarchy: **Duane  Reavis → Reavis Mining → Reavis Mining**

- 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

- **operator_operates_mine:** Reavis Mining → Reavis Mining; 2009-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duane  Reavis → Reavis Mining; 2009-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane  Reavis → Reavis Mining; 2009-01-20 to current/open; source msha-controller-operator-history