# Relationship history for MSHA mine 4609064

Current hierarchy: **Esta Calvin  Wilson → Wilson & Wilson → Barrackville Refuse Pile**

- 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:** Wilson & Wilson → Barrackville Refuse Pile; 2004-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Esta Calvin  Wilson → Barrackville Refuse Pile; 2004-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Esta Calvin  Wilson → Wilson & Wilson; 2004-09-21 to current/open; source msha-controller-operator-history