# Relationship history for MSHA mine 3003239

Current hierarchy: **Cortland County-Ny → Cortland County Highway Department → Kolman Screen #164**

- 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:** Cortland County-Ny → Kolman Screen #164; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cortland County Highway Department → Kolman Screen #164; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cortland County-Ny → Cortland County Highway Department; 1998-09-01 to current/open; source msha-controller-operator-history