# Relationship history for MSHA mine 2301926

Current hierarchy: **Hunt Midwest Enterprises → Hunt Midwest Mining Inc → Stamper Quarry**

- 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:** Hunt Midwest Mining Inc → Stamper Quarry; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Midwest Enterprises → Stamper Quarry; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises → Hunt Midwest Mining Inc; 1985-06-01 to current/open; source msha-controller-operator-history