# Relationship history for MSHA mine 2800537

Current hierarchy: **S C R-Sibelco Nv → Unisil Corp Of New Jersey → Unisil-Millville 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:** Unisil Corp Of New Jersey → Unisil-Millville Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → Unisil-Millville Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unisil Corp Of New Jersey; 1950-01-01 to current/open; source msha-controller-operator-history