# Relationship history for MSHA mine 1509926

Current hierarchy: **Epling Don → Brashae Coal Company → No 1 Surface**

- 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:** Ratliff Blake → No 1 Surface; 1975-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountaineer Resources Inc → No 1 Surface; 1976-08-01 to 1978-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Blake → Mountaineer Resources Inc; 1976-08-01 to 1978-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Mountaineer Resources Inc → No 1 Surface; 1978-06-02 to 1983-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Beaird J F → No 1 Surface; 1978-06-02 to 1983-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Beaird J F → Mountaineer Resources Inc; 1978-06-02 to 1983-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Grateside Coals Inc → No 1 Surface; 1983-09-27 to 1987-12-23; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ralph → No 1 Surface; 1983-09-27 to 1987-12-23; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → Grateside Coals Inc; 1983-09-27 to 1987-12-23; source msha-controller-operator-history
- **operator_operates_mine:** Brashae Coal Company → No 1 Surface; 1987-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Epling Don → No 1 Surface; 1987-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Epling Don → Brashae Coal Company; 1987-12-24 to current/open; source msha-controller-operator-history