# Relationship history for MSHA mine 3401468

Current hierarchy: **Walls Leon → Dirt Company → Hicks Pit**

- 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:** Hutto Truck & Loader Service → Hicks Pit; 1984-08-01 to 1985-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Hutto James T → Hicks Pit; 1984-08-01 to 1985-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Hutto James T → Hutto Truck & Loader Service; 1984-08-01 to 1985-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Dirt Company → Hicks Pit; 1985-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walls Leon → Hicks Pit; 1985-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walls Leon → Dirt Company; 1985-05-24 to current/open; source msha-controller-operator-history