# Relationship history for MSHA mine 2003384

Current hierarchy: **Lake County-Mi → Lake County Road Commission → Sand Screen**

- 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

- **controller_controls_mine:** Lake County-Mi → Sand Screen; 1981-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lake County Road Commission → Sand Screen; 2007-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lake County-Mi → Lake County Road Commission; 2007-06-13 to current/open; source msha-controller-operator-history