# Relationship history for MSHA mine 4002567

Current hierarchy: **Conley Ronald → Regal Coals Inc → Regal Coals**

- 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:** Conley Ronald → Regal Coals; 1974-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Regal Coals Inc → Regal Coals; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conley Ronald → Regal Coals Inc; 1979-12-01 to current/open; source msha-controller-operator-history