# Relationship history for MSHA mine 2102908

Current hierarchy: **Knife River Corporation → Northstar Materials Incorporated → Crusher #43519**

- 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:** W T  Thorson → Crusher #43519; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  McCormick → Crusher #43519; 1981-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradley E  Bagge → Crusher #43519; 1982-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Valley Aggregates Inc → Crusher #43519; 1983-05-01 to 1986-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Bradley E  Bagge → Mid-Valley Aggregates Inc; 1983-05-01 to 1986-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Valley Contracting → Crusher #43519; 1986-09-17 to 1990-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Steve  McCormick → Valley Contracting; 1986-09-17 to 1990-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Thorson Inc → Crusher #43519; 1990-08-03 to 2003-04-13; source msha-controller-operator-history
- **controller_controls_operator:** W T  Thorson → Thorson Inc; 1990-08-03 to 2003-04-13; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Crusher #43519; 2002-03-14 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Northstar Materials Incorporated → Crusher #43519; 2003-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Northstar Materials Incorporated; 2003-04-14 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Crusher #43519; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Northstar Materials Incorporated; 2023-06-01 to current/open; source msha-controller-operator-history