# Relationship history for MSHA mine 0203251

Current hierarchy: **Laurence  Harvey → Arizona General Engineering Contracting, Inc → Santa Cruz Mobile 1**

- 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 → Santa Cruz Mobile 1; 2006-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arizona General Engineering Contracting, Inc → Santa Cruz Mobile 1; 2009-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laurence  Harvey → Arizona General Engineering Contracting, Inc; 2009-07-31 to current/open; source msha-controller-operator-history