# Relationship history for MSHA mine 3503689

Current hierarchy: **Harney County-OR → Harney County Road Dept → Portable 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

- **operator_operates_mine:** Harney County Road Dept → Portable Crusher; 2008-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harney County-OR → Portable Crusher; 2008-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harney County-OR → Harney County Road Dept; 2008-03-27 to current/open; source msha-controller-operator-history