# Relationship history for MSHA mine 2002983

Current hierarchy: **Basilisco Addario → Tri-Star Sand & Gravel Inc → CHURCHILL**

- 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

- **operator_operates_mine:** Tri-Star Sand & Gravel Inc → CHURCHILL; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Basilisco Addario → CHURCHILL; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basilisco Addario → Tri-Star Sand & Gravel Inc; 1996-06-01 to current/open; source msha-controller-operator-history