# Relationship history for MSHA mine 1302222

Current hierarchy: **Knife River Corporation → Knife River Corporation North Central → 503418**

- 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:** Bauerly Brothers Inc → 503418; 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Curtis G Roverud et al → 503418; 1950-01-01 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Charles P  Becker → 503418; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Becker Gravel Company Inc → 503418; 1998-11-01 to 2004-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Charles P  Becker → Becker Gravel Company Inc; 1998-11-01 to 2004-09-12; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → 503418; 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → 503418; 2004-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Midwest LLC → 503418; 2004-09-13 to 2012-02-06; 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:** Jeff C 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 2012-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation North Central → 503418; 2012-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Knife River Corporation North Central; 2012-02-07 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation North Central; 2012-02-07 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → 503418; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Corporation North Central; 2023-06-01 to current/open; source msha-controller-operator-history