# Relationship history for MSHA mine 3200778

Current hierarchy: **Knife River Corporation → Knife River Corporation-North Central → Crusher #3 (portable)**

- 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 → Crusher #3 (portable); 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Leo  Klein Jr → Crusher #3 (portable); 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Construction Inc → Crusher #3 (portable); 2000-04-01 to 2003-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Leo  Klein Jr → Pioneer Construction Inc; 2000-04-01 to 2003-07-01; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Crusher #3 (portable); 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Atlas Inc a Division of Knife River Corporation → Crusher #3 (portable); 2003-07-02 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Crusher #3 (portable); 2003-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Atlas Inc a Division of Knife River Corporation; 2003-07-02 to 2007-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-North Central → Crusher #3 (portable); 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Knife River Corporation-North Central; 2008-01-01 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-North Central; 2008-01-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Crusher #3 (portable); 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