# Relationship history for MSHA mine 1519823

Current hierarchy: **Lexington Coal Holdings, Inc → Lexington Coal Company, LLC → White Oak**

- 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:** Lexington Coal Holdings, Inc → White Oak; 2017-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company, LLC → White Oak; 2018-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Holdings, Inc → Lexington Coal Company, LLC; 2018-01-23 to current/open; source msha-controller-operator-history