# Relationship history for MSHA mine 4605490

Current hierarchy: **Younce Leonard → New River Fuel Inc → Mine No 26 - Kelly Hatfield**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Westmoreland Coal Company → Mine No 26 - Kelly Hatfield; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Younce Leonard → Mine No 26 - Kelly Hatfield; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Mine No 26 - Kelly Hatfield; 1977-05-01 to 1981-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1977-05-01 to 1981-08-26; source msha-controller-operator-history
- **operator_operates_mine:** New River Fuel Inc → Mine No 26 - Kelly Hatfield; 1981-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Younce Leonard → New River Fuel Inc; 1981-08-27 to current/open; source msha-controller-operator-history