# Relationship history for MSHA mine 2102640

Current hierarchy: **Knife River Corporation → Knife River North Central → 45970**

- 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 → 45970; 1950-01-01 to 2001-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Pierz Ready Mix → 45970; 1978-03-09 to 1989-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Przybilla → 45970; 1978-03-09 to 1989-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Przybilla → Pierz Ready Mix; 1978-03-09 to 1989-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Pierz Ready Mix → 45970; 1989-06-27 to 1998-04-28; source msha-controller-operator-history
- **controller_controls_mine:** James V  Litke → 45970; 1989-06-27 to 1998-04-28; source msha-controller-operator-history
- **controller_controls_operator:** James V  Litke → Pierz Ready Mix; 1989-06-27 to 1998-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Knife River North Central → 45970; 1998-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bauerly Brothers Inc → Knife River North Central; 1998-04-29 to 2001-04-25; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → 45970; 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 → 45970; 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