# Relationship history for MSHA mine 5400120

Current hierarchy: **Cementos Argos S A → Argos Puerto Rico Corp → Cantera Espinosa**

- 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:** San Juan Cement Company Inc → Cantera Espinosa; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Arturo  Diaz Jr → Cantera Espinosa; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arturo  Diaz Jr → San Juan Cement Company Inc; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Argos Puerto Rico Corp → Cantera Espinosa; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Italcementi Spa → Cantera Espinosa; 1991-04-01 to 2016-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Italcementi Spa → Argos Puerto Rico Corp; 1991-04-01 to 2016-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Cantera Espinosa; 2016-10-12 to 2017-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Argos Puerto Rico Corp; 2016-10-12 to 2017-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Argos S A → Cantera Espinosa; 2017-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Argos S A → Argos Puerto Rico Corp; 2017-02-09 to current/open; source msha-controller-operator-history