# Relationship history for MSHA mine 2902290

Current hierarchy: **Alex  Ulibarri → Ulibarri's Excavating → Ulibarri's Excavating**

- 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:** Ulibarri's Excavating → Ulibarri's Excavating; 2005-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alex  Ulibarri → Ulibarri's Excavating; 2005-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex  Ulibarri → Ulibarri's Excavating; 2005-08-16 to current/open; source msha-controller-operator-history