# Relationship history for MSHA mine 5400416

Current hierarchy: **Leopoldo  Pedraza → Las Piedras Sand Inc → CANTERA SAN ISDRO**

- 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:** Leopoldo  Pedraza → CANTERA SAN ISDRO; 1996-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Las Piedras Sand Inc → CANTERA SAN ISDRO; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leopoldo  Pedraza → Las Piedras Sand Inc; 1999-04-01 to current/open; source msha-controller-operator-history