# Relationship history for MSHA mine 2302302

Current hierarchy: **Brent  Bell; Brian  Bell → Bell Sand and Gravel → Bell Sand and 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Bell Sand and Gravel → Bell Sand and Gravel; 2005-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Bell et al → Bell Sand and Gravel; 2005-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Bell et al → Bell Sand and Gravel; 2005-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Bell et al → Bell Sand and Gravel; 2005-01-19 to current/open; source msha-controller-operator-history