# Relationship history for MSHA mine 4003333

Current hierarchy: **Darrell  Wagner → Solid Fuel Inc. → No. 1**

- 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

- **controller_controls_mine:** Wilma  Wagner → No. 1; 2003-04-23 to 2011-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Solid Fuel Inc. → No. 1; 2008-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilma  Wagner → Solid Fuel Inc.; 2008-09-02 to 2011-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Wagner → No. 1; 2011-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Wagner → Solid Fuel Inc.; 2011-08-12 to current/open; source msha-controller-operator-history