# Relationship history for MSHA mine 1301903

Current hierarchy: **Hosteng Don → Hosteng Concrete & Gravel Inc → Sac City Pit**

- 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:** Calhoun County-Ia → Sac City Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hosteng Don → Sac City Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calhoun County Highway Department → Sac City Pit; 1979-01-01 to 1984-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Calhoun County-Ia → Calhoun County Highway Department; 1979-01-01 to 1984-12-17; source msha-controller-operator-history
- **operator_operates_mine:** Hosteng Concrete & Gravel Inc → Sac City Pit; 1984-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hosteng Don → Hosteng Concrete & Gravel Inc; 1984-12-18 to current/open; source msha-controller-operator-history