# Relationship history for MSHA mine 1600509

Current hierarchy: **Cargill Inc → Cargill Deicing Technology → AVERY ISLAND**

- 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

- **controller_controls_mine:** Cargill Inc → AVERY ISLAND; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Akzo Nobel Salt Inc → AVERY ISLAND; 1950-01-01 to 1997-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Akzo Nobel N V → AVERY ISLAND; 1950-01-01 to 1997-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Akzo Nobel N V → Akzo Nobel Salt Inc; 1950-01-01 to 1997-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Cargill Salt → AVERY ISLAND; 1997-04-26 to 2005-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Cargill Inc → Cargill Salt; 1997-04-26 to 2005-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Cargill Deicing Technology → AVERY ISLAND; 2005-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cargill Inc → Cargill Deicing Technology; 2005-06-10 to current/open; source msha-controller-operator-history