# Relationship history for MSHA mine 3304637

Current hierarchy: **Charles C  Ungurean → CCU Coal & Construction LLC → CCU Athens Strip**

- 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:** Charles C  Ungurean → CCU Athens Strip; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining Co. LLC → CCU Athens Strip; 2009-11-30 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining Co. LLC; 2009-11-30 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → CCU Athens Strip; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Oxford Mining Co. LLC; 2015-01-01 to 2022-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Ungurean → CCU Athens Strip; 2019-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CCU Coal & Construction LLC → CCU Athens Strip; 2022-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → CCU Coal & Construction LLC; 2022-06-03 to current/open; source msha-controller-operator-history