# Relationship history for MSHA mine 0203138

Current hierarchy: **Abelardo  De Anda → Huachuca Concrete Inc → Huachuca Concrete Wash Plant #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Abelardo  De Anda → Huachuca Concrete Wash Plant #2; 1988-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Huachuca Concrete Inc → Huachuca Concrete Wash Plant #2; 2006-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Abelardo  De Anda → Huachuca Concrete Inc; 2006-08-16 to current/open; source msha-controller-operator-history