# Relationship history for MSHA mine 2500477

Current hierarchy: **PERKINS COUNTY-NE → Perkins County → Deaver**

- 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:** Perkins County → Deaver; 2001-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** PERKINS COUNTY-NE → Deaver; 2001-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** PERKINS COUNTY-NE → Perkins County; 2001-03-12 to current/open; source msha-controller-operator-history