# Relationship history for MSHA mine 4202002

Current hierarchy: **Grand County-Ut → Grand County Road Department → County Screen**

- 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:** Grand County Road Department → County Screen; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grand County-Ut → County Screen; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grand County-Ut → Grand County Road Department; 1987-03-01 to current/open; source msha-controller-operator-history