# Relationship history for MSHA mine 4701555

Current hierarchy: **Fond Du Lac County → Fond Du Lac County Highway Department → Reischke 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

- **operator_operates_mine:** Fond Du Lac County Highway Department → Reischke Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fond Du Lac County → Reischke Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fond Du Lac County → Fond Du Lac County Highway Department; 1950-01-01 to current/open; source msha-controller-operator-history