# Relationship history for MSHA mine 1519347

Current hierarchy: **George Chris  Waugh → Black Thunder Mining Inc → #3**

- 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:** George Chris  Waugh → #3; 2008-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inner Mountain Mining, Inc → #3; 2008-11-10 to 2010-01-20; source msha-controller-operator-history
- **controller_controls_operator:** George Chris  Waugh → Inner Mountain Mining, Inc; 2008-11-10 to 2010-01-20; source msha-controller-operator-history
- **controller_controls_mine:** George Chris  Waugh → #3; 2009-07-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Thunder Mining Inc → #3; 2010-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George Chris  Waugh → Black Thunder Mining Inc; 2010-01-21 to current/open; source msha-controller-operator-history