# Relationship history for MSHA mine 4605120

Current hierarchy: **Scholl Rex → P & S Coal Company → No 1 Surface Auger**

- 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:** Scholl Rex Et Al → No 1 Surface Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & S Coal Company → No 1 Surface Auger; 1976-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scholl Rex Et Al → P & S Coal Company; 1976-03-01 to current/open; source msha-controller-operator-history