# Relationship history for MSHA mine 0202310

Current hierarchy: **Mohave County-AZ → Mohave County Road Department → Screenmachine Portable**

- 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:** Mohave County Road Department → Screenmachine Portable; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mohave County-AZ → Screenmachine Portable; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mohave County-AZ → Mohave County Road Department; 1986-06-01 to current/open; source msha-controller-operator-history