# Relationship history for MSHA mine 5400270

Current hierarchy: **Amador Demetrio → Amhro Inc → Arenero Amhro**

- 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:** Amhro Inc → Arenero Amhro; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amador Demetrio → Arenero Amhro; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amador Demetrio → Amhro Inc; 1982-10-01 to current/open; source msha-controller-operator-history