# Relationship history for MSHA mine 1519158

Current hierarchy: **Roy M  Williamson → Coal River Fuels LLC → HWM 009-001**

- 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

- **operator_operates_mine:** Coal River Fuels LLC → HWM 009-001; 2007-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy M  Williamson → HWM 009-001; 2007-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy M  Williamson → Coal River Fuels LLC; 2007-10-30 to current/open; source msha-controller-operator-history