# Relationship history for MSHA mine 5400436

Current hierarchy: **Sigfredo  Velez → Nrs Universal Contractors Of Pr → ARENERO VEGA BAJA**

- 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

- **controller_controls_mine:** Sigfredo  Velez → ARENERO VEGA BAJA; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N R S Universal Contractors Of Pr Inc → ARENERO VEGA BAJA; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sigfredo  Velez → N R S Universal Contractors Of Pr Inc; 2000-12-01 to current/open; source msha-controller-operator-history