# Relationship history for MSHA mine 4002544

Current hierarchy: **Layne Willard--Frank Roark & John P Malpert → New River Coals Ltd → No 1 Surface**

- 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:** New River Coals Ltd → No 1 Surface; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Layne Willard--Frank Roark & John P Malpert → No 1 Surface; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Willard--Frank Roark & John P Malpert → New River Coals Ltd; 1979-08-01 to current/open; source msha-controller-operator-history