# Relationship history for MSHA mine 2402176

Current hierarchy: **MDU Resources Group Inc → Mc Elroy & Wilken, Inc. → Tutvedt Pit**

- 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:** Wilken Gary → Tutvedt Pit; 1950-01-01 to 2003-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Mc Elroy & Wilken, Inc. → Tutvedt Pit; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilken Gary → Mc Elroy & Wilken, Inc.; 1999-07-01 to 2003-04-13; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Tutvedt Pit; 2003-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Mc Elroy & Wilken, Inc.; 2003-04-14 to current/open; source msha-controller-operator-history