# Relationship history for MSHA mine 4801670

Current hierarchy: **Knife River Corporation → JTL Group, Inc. → V R Pit**

- 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 → V R Pit; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** JTL Group, Inc. → V R Pit; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → JTL Group, Inc.; 2005-03-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → V R Pit; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → JTL Group, Inc.; 2023-06-01 to current/open; source msha-controller-operator-history