# Relationship history for MSHA mine 4405401

Current hierarchy: **Owens Donald → Westwood Coal Company → No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Deel Lando → No 1 Mine; 1979-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Circle L Coal Company → No 1 Mine; 1980-06-01 to 1980-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Deel Lando → Circle L Coal Company; 1980-06-01 to 1980-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Westwood Coal Company → No 1 Mine; 1980-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owens Donald Et Al → No 1 Mine; 1980-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Donald Et Al → Westwood Coal Company; 1980-10-29 to current/open; source msha-controller-operator-history