# Relationship history for MSHA mine 5400194

Current hierarchy: **Cemex S A → Cemex  Puerto Rico → Florida Lime**

- 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:** Cemex  Puerto Rico → Florida Lime; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Puerto Rican Cement Company Inc → Florida Lime; 1950-01-01 to 2002-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Puerto Rican Cement Company Inc → Cemex  Puerto Rico; 1950-01-01 to 2002-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Florida Lime; 2002-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex  Puerto Rico; 2002-11-30 to current/open; source msha-controller-operator-history