# Relationship history for MSHA mine 0505031

Current hierarchy: **Thomas  O'Rourke → O'Rourke Excavating → O'Rourke Pit at South Fork**

- 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

- **operator_operates_mine:** O'Rourke Excavating → O'Rourke Pit at South Fork; 2014-09-11 to 2017-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  O'Rourke → O'Rourke Pit at South Fork; 2014-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  O'Rourke → O'Rourke Excavating; 2014-09-11 to 2017-05-09; source msha-controller-operator-history
- **operator_operates_mine:** O'Rourke Excavating → O'Rourke Pit at South Fork; 2017-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  O'Rourke → O'Rourke Pit at South Fork; 2017-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  O'Rourke → O'Rourke Excavating; 2017-05-10 to current/open; source msha-controller-operator-history