# Relationship history for MSHA mine 1401713

Current hierarchy: **Jerrold  Unruh → Bentley Sand Co. LLC → Bentley Sand Co. LLC**

- 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:** Bentley Sand Co. LLC → Bentley Sand Co. LLC; 2010-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerrold  Unruh → Bentley Sand Co. LLC; 2010-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerrold  Unruh → Bentley Sand Co. LLC; 2010-02-04 to current/open; source msha-controller-operator-history