# Relationship history for MSHA mine 3500512

Current hierarchy: **Knife River Corporation → Knife River Corporation-Northwest → KIRTLAND**

- 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:** M C Lininger & Sons Inc → KIRTLAND; 1950-01-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_mine:** C Gregg  Lininger → KIRTLAND; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C Gregg  Lininger → M C Lininger & Sons Inc; 1950-01-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Earl W  Lininger et al → KIRTLAND; 1983-06-28 to 1990-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → KIRTLAND; 1988-06-02 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Earl W  Lininger et al → Rogue Aggregates Inc; 1988-06-02 to 1990-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → KIRTLAND; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Terra Industries Inc → KIRTLAND; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Terra Industries Inc → Rogue Aggregates Inc; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → KIRTLAND; 1993-09-01 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → KIRTLAND; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Rogue Aggregates Inc; 1993-09-01 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → KIRTLAND; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-Northwest → KIRTLAND; 2010-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-Northwest; 2010-08-18 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → KIRTLAND; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Corporation-Northwest; 2023-06-01 to current/open; source msha-controller-operator-history