# Relationship history for MSHA mine 0301909

Current hierarchy: **Van Buren County-Ar → Van Buren County → Van Buren County 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Van Buren County-Ar → Van Buren County Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Van Buren County → Van Buren County Crusher; 2008-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van Buren County-Ar → Van Buren County; 2008-10-08 to current/open; source msha-controller-operator-history