# Relationship history for MSHA mine 2003710

Current hierarchy: **Huron County-MI → Huron County Road Commission → Robinson 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Huron County-MI → Robinson Pit; 2003-05-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Huron County Road Commission → Robinson Pit; 2026-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Huron County-MI → Huron County Road Commission; 2026-08-17 to current/open; source msha-controller-operator-history