# Relationship history for MSHA mine 0203200

Current hierarchy: **Laurence  Harvey → Arizona General Engineering Contracting Inc → Rio Rico 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:** Laurence  Harvey → Rio Rico Pit; 2006-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arizona General Engineering Contracting Inc → Rio Rico Pit; 2007-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laurence  Harvey → Arizona General Engineering Contracting Inc; 2007-11-01 to current/open; source msha-controller-operator-history