# Relationship history for MSHA mine 4406302

Current hierarchy: **Charles D  Litton → T & T Darby Coal Company Inc → No 1 Auger**

- 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

- **controller_controls_mine:** Charles D  Litton → No 1 Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & T Darby Coal Company Inc → No 1 Auger; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Litton → T & T Darby Coal Company Inc; 1986-06-01 to current/open; source msha-controller-operator-history