# Relationship history for MSHA mine 4003225

Current hierarchy: **John  Baron → John Baron Company → Big Lick Quarry**

- 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:** John Baron Company → Big Lick Quarry; 2004-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Baron → Big Lick Quarry; 2004-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Baron → John Baron Company; 2004-05-04 to current/open; source msha-controller-operator-history