# Relationship history for MSHA mine 0202689

Current hierarchy: **Greenlee County-Az → Greenlee County → Virden Gravel Pit - Greenlee County**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Greenlee County → Virden Gravel Pit - Greenlee County; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greenlee County-Az → Virden Gravel Pit - Greenlee County; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greenlee County-Az → Greenlee County; 1997-09-01 to current/open; source msha-controller-operator-history