# Relationship history for MSHA mine 1000307

Current hierarchy: **Donald  Bowman → Bowman Sand & Gravel Inc → Bowman 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

- **operator_operates_mine:** Bowman Sand & Gravel Inc → Bowman Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Bowman → Bowman Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Bowman → Bowman Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history