# Relationship history for MSHA mine 2402515

Current hierarchy: **Madison County-MT → Madison County → 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

- **controller_controls_mine:** Madison County-MT → Portable Crusher; 1992-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Madison County → Portable Crusher; 2008-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Madison County-MT → Madison County; 2008-05-29 to current/open; source msha-controller-operator-history