# Relationship history for MSHA mine 1202498

Current hierarchy: **Ozinga Bros Incorporated → Ozinga Materials, Inc. → Ozinga Materials Hanna**

- 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:** Ozinga Bros Incorporated → Ozinga Materials Hanna; 2004-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Old School Crushing Company, Inc → Ozinga Materials Hanna; 2021-05-01 to 2023-10-03; source msha-controller-operator-history
- **controller_controls_mine:** John  Dillinger → Ozinga Materials Hanna; 2021-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Dillinger → Old School Crushing Company, Inc; 2021-05-01 to 2023-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Ozinga Materials, Inc. → Ozinga Materials Hanna; 2023-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ozinga Bros Incorporated → Ozinga Materials, Inc.; 2023-10-04 to current/open; source msha-controller-operator-history