# Relationship history for MSHA mine 2602352

Current hierarchy: **Hinton David → Tortuga Mining Company Inc → VANDERBILT**

- 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:** Hinton David → VANDERBILT; 1998-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tortuga Mining Company Inc → VANDERBILT; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hinton David → Tortuga Mining Company Inc; 1998-05-01 to current/open; source msha-controller-operator-history