# Relationship history for MSHA mine 5400448

Current hierarchy: **Pedro A  Marrero → Marrero Sand → Marrero Sand**

- 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:** Marrero Sand → Marrero Sand; 2002-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pedro A  Marrero → Marrero Sand; 2002-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pedro A  Marrero → Marrero Sand; 2002-03-06 to current/open; source msha-controller-operator-history