# Relationship history for MSHA mine 4201491

Current hierarchy: **Carbon County-Ut → CARBON COUNTY ROAD DEPARTMENT → MOBILE #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:** Carbon County-Ut → MOBILE #1; 1980-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carbon County Road Department → MOBILE #1; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carbon County-Ut → Carbon County Road Department; 1985-07-01 to current/open; source msha-controller-operator-history