# Relationship history for MSHA mine 2902379

Current hierarchy: **Thomas G  McCauley → T.G. McCauley Construction → Powerscreen**

- 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:** T.G. McCauley Construction → Powerscreen; 2008-07-11 to 2012-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G  McCauley → Powerscreen; 2008-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  McCauley → T.G. McCauley Construction; 2008-07-11 to 2012-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G  McCauley → Powerscreen; 2011-02-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T.G. McCauley Construction → Powerscreen; 2012-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G  McCauley → T.G. McCauley Construction; 2012-08-09 to current/open; source msha-controller-operator-history