# Relationship history for MSHA mine 1301605

Current hierarchy: **Winnebago County → Winnebago County Highway Department → Ambrson-Hadacek-Hanna-Otis & Eight-Mile**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Winnebago County Highway Department → Ambrson-Hadacek-Hanna-Otis & Eight-Mile; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Winnebago County → Ambrson-Hadacek-Hanna-Otis & Eight-Mile; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winnebago County → Winnebago County Highway Department; 1950-01-01 to current/open; source msha-controller-operator-history