# Relationship history for MSHA mine 3303288

Current hierarchy: **Charles C  Ungurean → CCU Coal and Construction LLC → CCU Barb Coal Tipple**

- 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:** Shell Oil Company → CCU Barb Coal Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Ungurean → CCU Barb Coal Tipple; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** R & F Coal Company → CCU Barb Coal Tipple; 1975-01-01 to 1992-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → R & F Coal Company; 1975-01-01 to 1992-11-15; source msha-controller-operator-history
- **operator_operates_mine:** R & F Coal Company → CCU Barb Coal Tipple; 1992-11-16 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → CCU Barb Coal Tipple; 1992-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → R & F Coal Company; 1992-11-16 to 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** R & F Coal Company → CCU Barb Coal Tipple; 1998-09-02 to 1998-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → CCU Barb Coal Tipple; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → R & F Coal Company; 1998-09-02 to 1998-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining Co LLC → CCU Barb Coal Tipple; 1998-12-23 to 2019-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining Co LLC; 1998-12-23 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → CCU Barb Coal Tipple; 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 2019-02-10; source msha-controller-operator-history
- **operator_operates_mine:** CCU Coal and Construction LLC → CCU Barb Coal Tipple; 2019-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Ungurean → CCU Barb Coal Tipple; 2019-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → CCU Coal and Construction LLC; 2019-02-11 to current/open; source msha-controller-operator-history