# Relationship history for MSHA mine 4405887

Current hierarchy: **Owens Donald → Westwood Coal Company → No 2a**

- 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:** Owens Donald Et Al → No 2a; 1980-10-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westwood Coal Company → No 2a; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Donald Et Al → Westwood Coal Company; 1982-05-01 to current/open; source msha-controller-operator-history