# Relationship history for MSHA mine 4103338

Current hierarchy: **George  Alvarez → Texas Southern Inc → Bell 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:** Shock Trucking Inc → Bell Pit; 1985-09-01 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Shock Nancy → Bell Pit; 1985-09-01 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Shock Nancy → Shock Trucking Inc; 1985-09-01 to 1989-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Texas Southern Inc → Bell Pit; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Alvarez → Bell Pit; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Alvarez → Texas Southern Inc; 1989-02-15 to current/open; source msha-controller-operator-history