# Relationship history for MSHA mine 4103746

Current hierarchy: **Zack  Burkett III → Zack Burkett Company → STEPHENS CO. PIT**

- 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

- **controller_controls_mine:** Zack  Burkett III → STEPHENS CO. PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Zack Burkett Company → STEPHENS CO. PIT; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zack  Burkett III → Zack Burkett Company; 1992-10-01 to current/open; source msha-controller-operator-history