# Relationship history for MSHA mine 2402264

Current hierarchy: **Knife River Corporation → Knife River dba JTL Group → DBRM Pit-North**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Charles  Donaldson → DBRM Pit-North; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → DBRM Pit-North; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Donaldson Brothers Ready Mix Inc → DBRM Pit-North; 2002-03-12 to 2026-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Donaldson → Donaldson Brothers Ready Mix Inc; 2002-03-12 to 2026-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → DBRM Pit-North; 2023-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River dba JTL Group → DBRM Pit-North; 2026-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River dba JTL Group; 2026-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River dba JTL Group; 2026-03-20 to 2023-05-31; source msha-controller-operator-history