# Relationship history for MSHA mine 3502382

Current hierarchy: **Knife River Corporation → Knife River Corporation-Northwest → METRO PORTABLE #5**

- 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:** Elte Construction Company → METRO PORTABLE #5; 1950-01-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** George W  Forman → METRO PORTABLE #5; 1950-01-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** George W  Forman → Elte Construction Company; 1950-01-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Leo  Casey → METRO PORTABLE #5; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Continental Crushing & Leasing → METRO PORTABLE #5; 1979-02-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Leo  Casey → Continental Crushing & Leasing; 1979-02-01 to 1979-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Don Obrist Inc → METRO PORTABLE #5; 1979-05-01 to 1986-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Don  Obrist → METRO PORTABLE #5; 1979-05-01 to 1986-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Don  Obrist → Don Obrist Inc; 1979-05-01 to 1986-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Portland East Corp → METRO PORTABLE #5; 1986-07-10 to 1988-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Glenn  Nelson → METRO PORTABLE #5; 1986-07-10 to 1988-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Nelson → Portland East Corp; 1986-07-10 to 1988-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Jim Turin & Sons Inc → METRO PORTABLE #5; 1988-02-22 to 2021-03-31; source msha-controller-operator-history
- **controller_controls_mine:** James C  Turin → METRO PORTABLE #5; 1988-02-22 to 2013-12-19; source msha-controller-operator-history
- **controller_controls_operator:** James C  Turin → Jim Turin & Sons Inc; 1988-02-22 to 2013-12-19; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → METRO PORTABLE #5; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel J  Turin et al → METRO PORTABLE #5; 2013-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel J  Turin et al → Jim Turin & Sons Inc; 2013-12-20 to 2021-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Dennis P  Turin et al → Jim Turin & Sons Inc; 2013-12-20 to 2021-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-Northwest → METRO PORTABLE #5; 2021-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-Northwest; 2021-04-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → METRO PORTABLE #5; 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