# Relationship history for MSHA mine 3502968

Current hierarchy: **Knife River Corporation → Knife River Corporation-Northwest → REED 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:** Morse Brothers Inc → REED PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Suhre Dwain → REED PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Sand & Gravel Company → REED PIT; 1979-12-01 to 1980-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Suhre Dwain → Alaska Sand & Gravel Company; 1979-12-01 to 1980-02-28; source msha-controller-operator-history
- **operator_operates_mine:** M P Materials Inc → REED PIT; 1980-03-01 to 1987-01-25; source msha-controller-operator-history
- **controller_controls_mine:** William J  Staats → REED PIT; 1980-03-01 to 1987-01-25; source msha-controller-operator-history
- **controller_controls_operator:** William J  Staats → M P Materials Inc; 1980-03-01 to 1987-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Morse Brothers Inc → REED PIT; 1987-01-26 to 1998-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Morse Brothers Inc → Morse Brothers Inc; 1987-01-26 to 1998-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-Northwest → REED PIT; 1998-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → REED PIT; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-Northwest; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → REED PIT; 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