# Relationship history for MSHA mine 4003312

Current hierarchy: **Gene  Willis → Willis Stone → Willis Stone**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Gene  Willis → Willis Stone; 2003-04-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Willis Stone → Willis Stone; 2008-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Willis → Willis Stone; 2008-01-08 to current/open; source msha-controller-operator-history