# Relationship history for MSHA mine 1302289

Current hierarchy: **MDU Resources Group Inc → Knife River Midwest LLC → Knife River Wash Plant #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Jeff C Roverud et al → Knife River Wash Plant #2; 1950-01-01 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Knife River Wash Plant #2; 2004-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Midwest LLC → Knife River Wash Plant #2; 2004-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff C Roverud et al → Knife River Midwest LLC; 2004-09-13 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Curtis G Roverud et al → Knife River Midwest LLC; 2004-09-13 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Midwest LLC; 2004-09-13 to current/open; source msha-controller-operator-history