# Relationship history for MSHA mine 0403949

Current hierarchy: **Cargill Inc → Leslie Salt Company → Newark Plant**

- 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

- **operator_operates_mine:** Leslie Salt Company → Newark Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cargill Inc → Newark Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cargill Inc → Leslie Salt Company; 1950-01-01 to current/open; source msha-controller-operator-history