# Relationship history for MSHA mine 1301741

Current hierarchy: **Cerro Gordo County-Ia → Cerro Gordo County Highway Department → Forbes Pit**

- 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:** Cerro Gordo County Highway Department → Forbes Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cerro Gordo County-Ia → Forbes Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cerro Gordo County-Ia → Cerro Gordo County Highway Department; 1950-01-01 to current/open; source msha-controller-operator-history