# Relationship history for MSHA mine 0405878

Current hierarchy: **Riverside County-CA → Riverside County Transportation Dept → 968AB Power 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:** Riverside County Transportation Dept → 968AB Power Screen; 2014-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riverside County-CA → 968AB Power Screen; 2014-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverside County-CA → Riverside County Transportation Dept; 2014-01-08 to current/open; source msha-controller-operator-history