# Relationship history for MSHA mine 3304471

Current hierarchy: **Westmoreland Coal Company → Oxford Mining → Oxford Auger No 1**

- 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:** Charles C  Ungurean → Oxford Auger No 1; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining → Oxford Auger No 1; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining; 2001-01-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Oxford Auger No 1; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Oxford Mining; 2015-01-01 to current/open; source msha-controller-operator-history