# Relationship history for MSHA mine 4003288

Current hierarchy: **Carmeuse Holding SA → Carmeuse Lime &Stone → Thornhill**

- 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:** Oglebay Norton Company → Thornhill; 1998-06-22 to 2008-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Carmeuse Lime &Stone → Thornhill; 2006-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Carmeuse Lime &Stone; 2006-11-29 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Thornhill; 2008-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Lime &Stone; 2008-02-13 to current/open; source msha-controller-operator-history