# Relationship history for MSHA mine 2103666

Current hierarchy: **Knife River Corporation → Knife River North Central → 503412**

- 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:** Bauerly Brothers Inc → 503412; 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → 503412; 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Kraemer Trucking & Excavating, Inc. → 503412; 2009-05-18 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Jeff J Kraemer → 503412; 2009-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff J Kraemer → Kraemer Trucking & Excavating, Inc.; 2009-05-18 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → 503412; 2023-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River North Central → 503412; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River North Central; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Knife River North Central; 2025-06-12 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River North Central; 2025-06-12 to 2023-05-31; source msha-controller-operator-history