# Relationship history for MSHA mine 2100596

Current hierarchy: **Knife River Corporation → Knife River North Central → 44481**

- 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:** Bauerly Brothers Inc → 44481; 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Rockite Gravel Company → 44481; 1950-01-01 to 1988-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Peterson et al → 44481; 1950-01-01 to 1988-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Peterson et al → Rockite Gravel Company; 1950-01-01 to 1988-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Knife River North Central → 44481; 1988-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Knife River North Central; 1988-06-29 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → 44481; 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River North Central; 2001-04-26 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → 44481; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River North Central; 2023-06-01 to current/open; source msha-controller-operator-history