# Relationship history for MSHA mine 3304413

Current hierarchy: **Westmoreland Coal Company → Oxford Mining Co.LLC → Standing Stone Mine**

- 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 → Standing Stone Mine; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Selway → Standing Stone Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Daron Coal Company Inc → Standing Stone Mine; 1998-04-01 to 2000-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Selway → Daron Coal Company Inc; 1998-04-01 to 2000-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining Co.LLC → Standing Stone Mine; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles C  Ungurean → Oxford Mining Co.LLC; 2000-05-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Standing Stone Mine; 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