# Relationship history for MSHA mine 2100449

Current hierarchy: **Knife River Corporation → Northstar Materials, Inc. → Wash Plant 45709**

- 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

- **operator_operates_mine:** Gesell Concrete Products Inc → Wash Plant 45709; 1950-01-01 to 2004-04-19; source msha-controller-operator-history
- **controller_controls_mine:** William  Gesell → Wash Plant 45709; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Gesell → Gesell Concrete Products Inc; 1950-01-01 to 2004-04-19; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Wash Plant 45709; 2002-03-14 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Northstar Materials, Inc. → Wash Plant 45709; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Northstar Materials, Inc.; 2004-04-20 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Wash Plant 45709; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Northstar Materials, Inc.; 2023-06-01 to current/open; source msha-controller-operator-history