# Relationship history for MSHA mine 4202238

Current hierarchy: **DTE Energy Company → DTE Utah Synfuels LLC → DTE Utah Synfuels LLC**

- 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:** Brent M  Cook → DTE Utah Synfuels LLC; 1999-02-01 to 2002-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Headwaters Inc → DTE Utah Synfuels LLC; 1999-03-01 to 2005-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Brent M  Cook → Headwaters Inc; 1999-03-01 to 2002-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Kirk A  Benson et al → DTE Utah Synfuels LLC; 2002-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk A  Benson et al → Headwaters Inc; 2002-12-02 to 2005-11-01; source msha-controller-operator-history
- **operator_operates_mine:** DTE Utah Synfuels LLC → DTE Utah Synfuels LLC; 2005-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DTE Energy Company → DTE Utah Synfuels LLC; 2005-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DTE Energy Company → DTE Utah Synfuels LLC; 2005-11-02 to current/open; source msha-controller-operator-history