# Relationship history for MSHA mine 5400415

Current hierarchy: **Ruben  Hernandez → Gravero de San Lorenzo, LLC → Gravero de San Lorenzo, LLC**

- 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:** Gravero San Lorenzo Corp. → Gravero de San Lorenzo, LLC; 1999-04-01 to 2014-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Miguel H  Placer → Gravero de San Lorenzo, LLC; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miguel H  Placer → Gravero San Lorenzo Corp.; 1999-04-01 to 2014-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Gravero de San Lorenzo, LLC → Gravero de San Lorenzo, LLC; 2014-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruben  Hernandez → Gravero de San Lorenzo, LLC; 2014-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Hernandez → Gravero de San Lorenzo, LLC; 2014-10-02 to current/open; source msha-controller-operator-history