# Relationship history for MSHA mine 1517987

Current hierarchy: **Ronnie D  Jackson → Twin Star Coal Company Inc → Sugar Tree**

- 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:** Donnie  Teague → Sugar Tree; 1986-12-01 to 2005-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Twin Star Coal Company Inc → Sugar Tree; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donnie  Teague → Twin Star Coal Company Inc; 1997-09-01 to 2005-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie D  Jackson → Sugar Tree; 2005-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie D  Jackson → Twin Star Coal Company Inc; 2005-06-21 to current/open; source msha-controller-operator-history