# Relationship history for MSHA mine 1512461

Current hierarchy: **Owens Bill → Willow Coal Inc → No 1**

- 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:** Willow Coal Inc → No 1; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owens Bill Et Al → No 1; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Bill Et Al → Willow Coal Inc; 1980-08-01 to current/open; source msha-controller-operator-history