# Relationship history for MSHA mine 2902387

Current hierarchy: **Nathan  Jessop → General Rock Products → General Rock Products - Thoreau 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:** Nathan  Jessop → General Rock Products - Thoreau Pit; 1999-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Rock Products → General Rock Products - Thoreau Pit; 2009-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathan  Jessop → General Rock Products; 2009-04-02 to current/open; source msha-controller-operator-history