# Relationship history for MSHA mine 2402145

Current hierarchy: **Knife River Corporation → Knife River Missoula → Small Portable Screen**

- 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:** A-1 Paving Inc → Small Portable Screen; 1998-07-01 to 2001-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Kevin M  Mohl  et al → Small Portable Screen; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin M  Mohl  et al → A-1 Paving Inc; 1998-07-01 to 2001-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Arnie A  Mohl  et al → A-1 Paving Inc; 1998-07-01 to 2001-11-15; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Small Portable Screen; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Missoula → Small Portable Screen; 2001-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Missoula; 2001-11-16 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Small Portable Screen; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Missoula; 2023-06-01 to current/open; source msha-controller-operator-history