# Relationship history for MSHA mine 5001629

Current hierarchy: **Willis Dean L → Willis Mine Services → Crooked Creek**

- 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 Mine Services → Crooked Creek; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willis Dean L → Crooked Creek; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willis Dean L → Willis Mine Services; 1995-05-01 to current/open; source msha-controller-operator-history