# Relationship history for MSHA mine 4104214

Current hierarchy: **John Charles  Wessling → Texas Sodium Bentonite Inc → TEXAS SODIUM BENTONITE INC**

- 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

- **operator_operates_mine:** Texas Sodium Bentonite Inc → TEXAS SODIUM BENTONITE INC; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Burton → TEXAS SODIUM BENTONITE INC; 2000-04-01 to 2024-08-14; source msha-controller-operator-history
- **controller_controls_operator:** George  Burton → Texas Sodium Bentonite Inc; 2000-04-01 to 2024-08-14; source msha-controller-operator-history
- **controller_controls_mine:** John Charles  Wessling → TEXAS SODIUM BENTONITE INC; 2024-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Charles  Wessling → Texas Sodium Bentonite Inc; 2024-08-15 to current/open; source msha-controller-operator-history