# Relationship history for MSHA mine 2003638

Current hierarchy: **Carmeuse Holding SA → O-N Minerals (Michigan) Company → Carmeuse, Port Inland - Corinne 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Oglebay Norton Company → Carmeuse, Port Inland - Corinne Pit; 1998-04-27 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Carmeuse, Port Inland - Corinne Pit; 2008-02-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** O-N Minerals (Michigan) Company → Carmeuse, Port Inland - Corinne Pit; 2022-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → O-N Minerals (Michigan) Company; 2022-12-01 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → O-N Minerals (Michigan) Company; 2022-12-01 to current/open; source msha-controller-operator-history