# Relationship history for MSHA mine 1103132

Current hierarchy: **Ozinga Bros Incorporated → Ozinga Materials, Inc. → Ozinga Materials, Inc. (Henry 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:** Kenin L  Edwards → Ozinga Materials, Inc. (Henry Pit); 2003-11-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Illinois River Holdings Inc → Ozinga Materials, Inc. (Henry Pit); 2004-06-07 to 2004-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Kenin L  Edwards → Illinois River Holdings Inc; 2004-06-07 to 2004-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Ozinga Materials, Inc. → Ozinga Materials, Inc. (Henry Pit); 2004-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ozinga Bros Incorporated → Ozinga Materials, Inc. (Henry Pit); 2004-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ozinga Bros Incorporated → Ozinga Materials, Inc.; 2004-08-23 to current/open; source msha-controller-operator-history