# Relationship history for MSHA mine 0203286

Current hierarchy: **Lawrence  Martinie → Southwest Exploration Research & Development LLC → Alvarado Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Southwest Exploration Research & Development LLC → Alvarado Mine; 2011-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  Martinie et al → Alvarado Mine; 2011-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Martinie et al → Southwest Exploration Research & Development LLC; 2011-06-28 to current/open; source msha-controller-operator-history