# Relationship history for MSHA mine 1301882

Current hierarchy: **Sioux County-Ia → Sioux County Highway Dept → Chatsworth Or Van Woudenberg 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sioux County Highway Dept → Chatsworth Or Van Woudenberg Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sioux County-Ia → Chatsworth Or Van Woudenberg Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sioux County-Ia → Sioux County Highway Dept; 1979-01-01 to current/open; source msha-controller-operator-history