# Relationship history for MSHA mine 1601359

Current hierarchy: **Alex P  Duplessis → Leon Duplessis & Sons, Inc. → Duplessis Sand Pit**

- 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:** Leon Duplessis & Sons Inc → Duplessis Sand Pit; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alex P  Duplessis → Duplessis Sand Pit; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex P  Duplessis → Leon Duplessis & Sons Inc; 2000-02-01 to current/open; source msha-controller-operator-history