# Relationship history for MSHA mine 5400090

Current hierarchy: **Cristobal Rodriguez  Arrillaga Jr → Canteras De Puerto Rico Inc → CANTERA DE PUERTO RICO**

- 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:** Canteras De Puerto Rico Inc → CANTERA DE PUERTO RICO; 1950-01-01 to 1981-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Rafael  Medina → CANTERA DE PUERTO RICO; 1950-01-01 to 1981-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Rafael  Medina → Canteras De Puerto Rico Inc; 1950-01-01 to 1981-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Canteras De Puerto Rico Inc → CANTERA DE PUERTO RICO; 1981-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cristobal Rodriguez  Arrillaga Jr  et al → CANTERA DE PUERTO RICO; 1981-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cristobal Rodriguez  Arrillaga Jr  et al → Canteras De Puerto Rico Inc; 1981-02-09 to current/open; source msha-controller-operator-history