# Relationship history for MSHA mine 2501169

Current hierarchy: **Wayne K  Weston → Weston Sand & Gravel → WESTON 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:** Weston Sand & Gravel → WESTON SAND AND GRAVEL; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne K  Weston → WESTON SAND AND GRAVEL; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne K  Weston → Weston Sand & Gravel; 1996-07-01 to current/open; source msha-controller-operator-history