# Relationship history for MSHA mine 5400441

Current hierarchy: **Cemex S A → Puerto Rican Cement Co. Inc → PLANTA PROCESAMIENTO MARTIN GONZ**

- 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

- **controller_controls_mine:** Puerto Rican Cement Company Inc → PLANTA PROCESAMIENTO MARTIN GONZ; 1950-01-01 to 2002-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Puerto Rican Cement Co. Inc → PLANTA PROCESAMIENTO MARTIN GONZ; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Puerto Rican Cement Company Inc → Puerto Rican Cement Co. Inc; 2001-04-01 to 2002-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → PLANTA PROCESAMIENTO MARTIN GONZ; 2002-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Puerto Rican Cement Co. Inc; 2002-11-30 to current/open; source msha-controller-operator-history