# Relationship history for MSHA mine 4201701

Current hierarchy: **Duchesne County-Ut → Duchesne County → PORTABLE CRUSHER NO. 1**

- 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:** Duchesne County-Ut → PORTABLE CRUSHER NO. 1; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Duchesne County → PORTABLE CRUSHER NO. 1; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duchesne County-Ut → Duchesne County; 1980-09-01 to current/open; source msha-controller-operator-history