# Relationship history for MSHA mine 2302150

Current hierarchy: **Ernie  Wilson → Wilson Sand & Gravel → WILSON 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:** Wilson Sand & Gravel → WILSON SAND AND GRAVEL; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ernie  Wilson → WILSON SAND AND GRAVEL; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernie  Wilson → Wilson Sand & Gravel; 1997-01-01 to current/open; source msha-controller-operator-history