# Relationship history for MSHA mine 2302505

Current hierarchy: **Bollinger County - Mo → Bollinger County Road Dept → Bollinger County Dept Sand & Gravel**

- 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:** Bollinger County - Mo → Bollinger County Dept Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bollinger County Road Dept → Bollinger County Dept Sand & Gravel; 2016-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bollinger County - Mo → Bollinger County Road Dept; 2016-04-12 to current/open; source msha-controller-operator-history