# Relationship history for MSHA mine 1518639

Current hierarchy: **John F  Hunt IV → SCH Terminal Services, LLC → Calvert City Terminal LLC**

- 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:** SCH Terminal Services, LLC → Calvert City Terminal LLC; 2003-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John F  Hunt III → Calvert City Terminal LLC; 2003-06-20 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_operator:** John F  Hunt III → SCH Terminal Services, LLC; 2003-06-20 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_mine:** John F  Hunt IV → Calvert City Terminal LLC; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Hunt IV → SCH Terminal Services, LLC; 2022-07-01 to current/open; source msha-controller-operator-history