# Relationship history for MSHA mine 1508091

Current hierarchy: **John E  Potter → Star Coal Company → No 15**

- 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:** John E  Potter et al → No 15; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sentenial Mines Inc → No 15; 1975-03-05 to 1980-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Hibbitts David E → No 15; 1975-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hibbitts David E → Sentenial Mines Inc; 1975-03-05 to 1980-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Star Coal Company → No 15; 1980-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Potter et al → Star Coal Company; 1980-02-20 to current/open; source msha-controller-operator-history