# Relationship history for MSHA mine 4604481

Current hierarchy: **Shepler Thomas → Use Coal Inc → Lifes Run**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Ynr Coal Company Inc → Lifes Run; 1975-10-01 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Randolph Roy D Et Al → Lifes Run; 1975-10-01 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Randolph Roy D Et Al → Ynr Coal Company Inc; 1975-10-01 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Shepler Thomas → Lifes Run; 1984-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Use Coal Inc → Lifes Run; 1987-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepler Thomas → Use Coal Inc; 1987-11-24 to current/open; source msha-controller-operator-history