# Relationship history for MSHA mine 1600021

Current hierarchy: **Kara L Dunham → Winn Rock LLC → Winn Rock, LLC**

- 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:** Winn Rock LLC → Winn Rock, LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sara M  Dunham → Winn Rock, LLC; 1950-01-01 to 2021-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Sara M  Dunham → Winn Rock LLC; 1950-01-01 to 2021-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Kara L Dunham → Winn Rock, LLC; 2021-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kara L Dunham → Winn Rock LLC; 2021-05-05 to current/open; source msha-controller-operator-history