# Relationship history for MSHA mine 3304443

Current hierarchy: **Charles  Ungurean → Oxford Mining → 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

- **operator_operates_mine:** Standing Stone Llc → STANDING STONE MINE; 1999-09-01 to 2000-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Arthur A  Downend → STANDING STONE MINE; 1999-09-01 to 2000-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Arthur A  Downend → Standing Stone Llc; 1999-09-01 to 2000-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Mining → STANDING STONE MINE; 2000-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Ungurean → STANDING STONE MINE; 2000-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Ungurean → Oxford Mining; 2000-05-15 to current/open; source msha-controller-operator-history