# Relationship history for MSHA mine 2401939

Current hierarchy: **Knife River Corporation → Knife River Belgrade → Figgins Portable Plant**

- 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:** Willie J  Figgins → Figgins Portable Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Figgins Sand & Gravel Inc → Figgins Portable Plant; 1991-05-01 to 2003-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Willie J  Figgins → Figgins Sand & Gravel Inc; 1991-05-01 to 2003-06-19; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Figgins Portable Plant; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Belgrade → Figgins Portable Plant; 2003-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Belgrade; 2003-06-20 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Figgins Portable Plant; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Belgrade; 2023-06-01 to current/open; source msha-controller-operator-history