# Relationship history for MSHA mine 4201994

Current hierarchy: **Uintah County - Ut → Uintah County → Rock Crusher**

- 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:** Uintah County - Ut → Rock Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Uintah County → Rock Crusher; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Uintah County - Ut → Uintah County; 1986-11-01 to current/open; source msha-controller-operator-history