# Relationship history for MSHA mine 3609233

Current hierarchy: **Barry  Reese → NORTHERN TIER STONE → CRAWFORD  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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** NORTHERN TIER STONE → CRAWFORD  QUARRY; 2004-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barry  Reese → CRAWFORD  QUARRY; 2004-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Reese → NORTHERN TIER STONE; 2004-04-26 to current/open; source msha-controller-operator-history