# Relationship history for MSHA mine 1514122

Current hierarchy: **Strohmier Gene → Harrison Construction Company Inc → Harrison Const Co Inc Mine No6**

- 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:** Strohmier Gene → Harrison Const Co Inc Mine No6; 1975-01-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Construction Company Inc → Harrison Const Co Inc Mine No6; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Strohmier Gene → Harrison Construction Company Inc; 1983-06-01 to current/open; source msha-controller-operator-history