# Relationship history for MSHA mine 2602788

Current hierarchy: **The Burrell Group LLC → West Coast Aggregate → Nye County Plant**

- 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:** West Coast Aggregate → Nye County Plant; 2016-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** The Burrell Group LLC → Nye County Plant; 2016-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Burrell Group LLC → West Coast Aggregate; 2016-02-18 to current/open; source msha-controller-operator-history