# Relationship history for MSHA mine 5400223

Current hierarchy: **Moreno Jose F → Puerto Rico Marble Industries Inc → Planta Candelaria**

- 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:** Puerto Rico Marble Industries Inc → Planta Candelaria; 1950-01-01 to 1985-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Rexco Industries Inc → Planta Candelaria; 1950-01-01 to 1985-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Rexco Industries Inc → Puerto Rico Marble Industries Inc; 1950-01-01 to 1985-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Puerto Rico Marble Industries Inc → Planta Candelaria; 1985-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moreno Jose F → Planta Candelaria; 1985-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moreno Jose F → Puerto Rico Marble Industries Inc; 1985-02-26 to current/open; source msha-controller-operator-history