# Relationship history for MSHA mine 2501268

Current hierarchy: **Travis  Smith → Two Rivers Sand & Gravel → Two Rivers Sand & Gravel**

- 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:** Two Rivers Sand & Gravel → Two Rivers Sand & Gravel; 2010-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Smith → Two Rivers Sand & Gravel; 2010-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Smith → Two Rivers Sand & Gravel; 2010-07-12 to current/open; source msha-controller-operator-history