# Relationship history for MSHA mine 1401616

Current hierarchy: **Hamilton County-KS → Hamilton County Road Department → Hamilton County Crusher 1**

- 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:** Hamilton County Road Department → Hamilton County Crusher 1; 2002-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton County-KS → Hamilton County Crusher 1; 2002-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton County-KS → Hamilton County Road Department; 2002-04-17 to current/open; source msha-controller-operator-history