# Relationship history for MSHA mine 0203217

Current hierarchy: **Alberto (Ayala)  Millan → Alberto Ayala Millan → Ayala Bluebird**

- 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

- **operator_operates_mine:** Alberto Ayala Millan → Ayala Bluebird; 2008-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alberto (Ayala)  Millan → Ayala Bluebird; 2008-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alberto (Ayala)  Millan → Alberto Ayala Millan; 2008-04-04 to current/open; source msha-controller-operator-history