# Relationship history for MSHA mine 0504530

Current hierarchy: **Jerry  Carpenter → Tri-River Inc → Yust Ranch Gravel 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:** Tri-River Inc → Yust Ranch Gravel Pit; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Carpenter → Yust Ranch Gravel Pit; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Carpenter → Tri-River Inc; 1993-08-01 to current/open; source msha-controller-operator-history