# Relationship history for MSHA mine 1513736

Current hierarchy: **Johnson Ralph → Southern Hills Mining Company Inc → Southern Hills Mining Co Inc**

- 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

- **operator_operates_mine:** Mountaintop Coal Company Inc → Southern Hills Mining Co Inc; 1982-09-01 to 1984-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Hylton Frank James & Earnie Williams → Southern Hills Mining Co Inc; 1982-09-01 to 1984-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Frank James & Earnie Williams → Mountaintop Coal Company Inc; 1982-09-01 to 1984-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Southern Hills Mining Company Inc → Southern Hills Mining Co Inc; 1984-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ralph → Southern Hills Mining Co Inc; 1984-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → Southern Hills Mining Company Inc; 1984-10-24 to current/open; source msha-controller-operator-history