# Relationship history for MSHA mine 5400374

Current hierarchy: **Ricardo  Cardona; Victor S  Maldonado → Master Aggregates Toa Baja Corp → Cantera Carolina  Pta #3**

- 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:** Victor S  Maldonado  et al → Cantera Carolina  Pta #3; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Empresas Master → Cantera Carolina  Pta #3; 1995-10-01 to 2006-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Ricardo  Cardona et al → Cantera Carolina  Pta #3; 1995-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricardo  Cardona et al → Empresas Master; 1995-10-01 to 2006-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Maldonado  et al → Empresas Master; 1995-10-01 to 2006-09-28; source msha-controller-operator-history
- **operator_operates_mine:** Master Aggregates Toa Baja Corp → Cantera Carolina  Pta #3; 2006-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Maldonado  et al → Master Aggregates Toa Baja Corp; 2006-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricardo  Cardona et al → Master Aggregates Toa Baja Corp; 2006-09-29 to current/open; source msha-controller-operator-history