# Relationship history for MSHA mine 5100305

Current hierarchy: **Knife River Corporation → West Hawaii Concrete → Portable Three (Eagle)**

- 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:** MDU Resources Group Inc → Portable Three (Eagle); 2001-07-19 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** West Hawaii Concrete → Portable Three (Eagle); 2011-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → West Hawaii Concrete; 2011-05-24 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Portable Three (Eagle); 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → West Hawaii Concrete; 2023-06-01 to current/open; source msha-controller-operator-history