# Relationship history for MSHA mine 5400470

Current hierarchy: **Alfonso M  Diaz → DMC Aggregates Corporation → El Coqui**

- 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:** DMC Aggregates Corporation → El Coqui; 2008-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alfonso M  Diaz → El Coqui; 2008-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfonso M  Diaz → DMC Aggregates Corporation; 2008-02-28 to current/open; source msha-controller-operator-history