# Relationship history for MSHA mine 2103118

Current hierarchy: **Cook County-Mn → Cook County Highway Department → COOK COUNTY HWY. DEPT.**

- 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:** Cook County Highway Department → COOK COUNTY HWY. DEPT.; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cook County-Mn → COOK COUNTY HWY. DEPT.; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cook County-Mn → Cook County Highway Department; 1996-05-01 to current/open; source msha-controller-operator-history