# Relationship history for MSHA mine 1519701

Current hierarchy: **Wendell  Lewis; Billy  Thomas → Highwall Mining, LLC → Big Shoal #1**

- 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:** Highwall Mining, LLC → Big Shoal #1; 2013-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Billy  Thomas et al → Big Shoal #1; 2013-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy  Thomas et al → Highwall Mining, LLC; 2013-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wendell  Lewis et al → Highwall Mining, LLC; 2013-03-27 to current/open; source msha-controller-operator-history