# Relationship history for MSHA mine 3303770

Current hierarchy: **Westmoreland Coal Company → Oxford Mining Co LLC → Rice #2 (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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shell Oil Company → Rice #2 (Strip); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles C  Ungurean → Rice #2 (Strip); 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** R & F Coal Company → Rice #2 (Strip); 1979-08-01 to 1992-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → R & F Coal Company; 1979-08-01 to 1992-11-15; source msha-controller-operator-history
- **operator_operates_mine:** R & F Coal Company → Rice #2 (Strip); 1992-11-16 to 2005-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Rice #2 (Strip); 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 2005-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining Co LLC → Rice #2 (Strip); 2005-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining Co LLC; 2005-04-21 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Rice #2 (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 current/open; source msha-controller-operator-history