# Relationship history for MSHA mine 4400693

Current hierarchy: **Metinvest B V → Wellmore Coal Company, LLC → Dock #14**

- 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:** United  Company → Dock #14; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crystal Coal Corp Inc → Dock #14; 1950-01-01 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Potter et al → Dock #14; 1950-01-01 to 1977-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Potter et al → Crystal Coal Corp Inc; 1950-01-01 to 1977-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Dock #14; 1977-09-01 to 2012-12-30; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1977-09-01 to 2012-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Dock #14; 2000-01-13 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Dock #14; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Dock #14; 2009-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Company, LLC → Dock #14; 2012-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Wellmore Coal Company, LLC; 2012-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Company, LLC; 2012-12-31 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Wellmore Coal Company, LLC; 2012-12-31 to 2006-01-01; source msha-controller-operator-history