# Relationship history for MSHA mine 5400230

Current hierarchy: **Ricardo  Cardona; Victor S  Maldonado → Master Aggregates Toa Baja Corp → Master Aggregates P-4**

- 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:** Master Concrete → Master Aggregates P-4; 1979-01-01 to 2003-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Victor S  Maldonado  et al → Master Aggregates P-4; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Maldonado  et al → Master Concrete; 1979-01-01 to 2003-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Ricardo  Cardona et al → Master Concrete; 1979-01-01 to 2003-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Master Aggregates Toa Baja Corp → Master Aggregates P-4; 2003-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricardo  Cardona et al → Master Aggregates Toa Baja Corp; 2003-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Victor S  Maldonado  et al → Master Aggregates Toa Baja Corp; 2003-10-16 to current/open; source msha-controller-operator-history