# Relationship history for MSHA mine 2402575

Current hierarchy: **Sanders County - MT → Sanders County → Sanders County Griz**

- 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

- **controller_controls_mine:** Sanders County - MT → Sanders County Griz; 1979-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sanders County → Sanders County Griz; 2011-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders County - MT → Sanders County; 2011-01-06 to current/open; source msha-controller-operator-history