# Relationship history for MSHA mine 2301706

Current hierarchy: **Korte Tom & Kevin Altom → Korte Quarry Inc → Kortes Portable #1**

- 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:** Ozark Concrete Company → Kortes Portable #1; 1978-03-09 to 1986-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Tinen John V → Kortes Portable #1; 1978-03-09 to 1986-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Tinen John V → Ozark Concrete Company; 1978-03-09 to 1986-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Korte'S Rock Quarry → Kortes Portable #1; 1986-12-03 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Korte Julius → Kortes Portable #1; 1986-12-03 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Korte Julius → Korte'S Rock Quarry; 1986-12-03 to 1995-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Korte Quarry Inc → Kortes Portable #1; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Korte Tom & Kevin Altom → Kortes Portable #1; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Korte Tom & Kevin Altom → Korte Quarry Inc; 1995-08-01 to current/open; source msha-controller-operator-history