# Relationship history for MSHA mine 0203516

Current hierarchy: **Jerry D Torgerson → Dirt at Jerry and Son Rock Products → Kaibab 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Dirt at Jerry and Son Rock Products → Kaibab Pit; 2024-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry D Torgerson → Kaibab Pit; 2024-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry D Torgerson → Dirt at Jerry and Son Rock Products; 2024-09-04 to current/open; source msha-controller-operator-history