# Relationship history for MSHA mine 0402634

Current hierarchy: **Elementis Plc → Elementis Specialties Inc → Newberry Mill**

- 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:** Rheox Inc → Newberry Mill; 1950-01-01 to 1998-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Nl Industries Inc → Newberry Mill; 1950-01-01 to 1998-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Nl Industries Inc → Rheox Inc; 1950-01-01 to 1998-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Elementis Specialties Inc → Newberry Mill; 1998-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elementis Plc → Newberry Mill; 1998-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elementis Plc → Elementis Specialties Inc; 1998-01-30 to current/open; source msha-controller-operator-history