# Relationship history for MSHA mine 2003335

Current hierarchy: **Kalkaska County-MI → Kalkaska County Road Commission → Kalkaska County Road Commission Portable**

- 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

- **operator_operates_mine:** Kalkaska County Road Commission → Kalkaska County Road Commission Portable; 2005-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kalkaska County-MI → Kalkaska County Road Commission Portable; 2005-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kalkaska County-MI → Kalkaska County Road Commission; 2005-10-18 to current/open; source msha-controller-operator-history