# Relationship history for MSHA mine 4607592

Current hierarchy: **Metinvest B V → Carter Roag Coal Company → Norton Rail Loadout**

- 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:** Cyprus Amax Minerals Company → Norton Rail Loadout; 1988-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Romie J  Bailey → Norton Rail Loadout; 1988-09-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bentley Coal Company → Norton Rail Loadout; 1988-10-01 to 1994-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Bentley Coal Company; 1988-10-01 to 1994-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Bohica Inc → Norton Rail Loadout; 1994-07-20 to 2004-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Romie J  Bailey → Bohica Inc; 1994-07-20 to 2004-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Carter Roag Coal Company → Norton Rail Loadout; 2004-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Norton Rail Loadout; 2004-10-22 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Carter Roag Coal Company; 2004-10-22 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Norton Rail Loadout; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Carter Roag Coal Company; 2009-04-30 to current/open; source msha-controller-operator-history