# Relationship history for MSHA mine 0100979

Current hierarchy: **Louisiana Land & Exploration Company → Warrior River Coal Company → Aland Strip**

- 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

- **operator_operates_mine:** Warrior River Coal Company → Aland Strip; 1975-02-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Wood Lloyd → Aland Strip; 1975-02-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Wood Lloyd → Warrior River Coal Company; 1975-02-01 to 1977-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Warrior River Coal Company → Aland Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louisiana Land & Exploration Company → Aland Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louisiana Land & Exploration Company → Warrior River Coal Company; 1977-11-01 to current/open; source msha-controller-operator-history