# Relationship history for MSHA mine 1901177

Current hierarchy: **Craig H  Willis → WILLIS ENTERPRISES, INC. → WHITE WOLF MINE**

- 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:** Willis Enterprises, Inc. → WHITE WOLF MINE; 2008-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig H  Willis → WHITE WOLF MINE; 2008-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig H  Willis → Willis Enterprises, Inc.; 2008-06-11 to current/open; source msha-controller-operator-history