# Relationship history for MSHA mine 1102882

Current hierarchy: **Ozinga Bros Incorporated → Ozinga Materials Inc → Ozinga Materials Inc (Main 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Poignant Gravel Pit → Ozinga Materials Inc (Main Pit); 1989-06-01 to 1991-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Leroy F Poignant Jr → Ozinga Materials Inc (Main Pit); 1989-06-01 to 1991-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Leroy F Poignant Jr → Poignant Gravel Pit; 1989-06-01 to 1991-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Poignant Gravel Pit → Ozinga Materials Inc (Main Pit); 1991-04-15 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_mine:** John F Hayes et al → Ozinga Materials Inc (Main Pit); 1991-04-15 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_operator:** John F Hayes et al → Poignant Gravel Pit; 1991-04-15 to 1996-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Poignant Sand & Gravel Inc → Ozinga Materials Inc (Main Pit); 1996-03-04 to 2002-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Leroy F Poignant Jr → Ozinga Materials Inc (Main Pit); 1996-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy F Poignant Jr → Poignant Sand & Gravel Inc; 1996-03-04 to 2002-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Reliable Materials Corp. of IL → Ozinga Materials Inc (Main Pit); 2002-04-23 to 2003-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Michael P  Vondra → Ozinga Materials Inc (Main Pit); 2002-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael P  Vondra → Reliable Materials Corp. of IL; 2002-04-23 to 2003-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Illinois River Holdings Inc → Ozinga Materials Inc (Main Pit); 2003-11-17 to 2004-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Kenin L  Edwards → Ozinga Materials Inc (Main Pit); 2003-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenin L  Edwards → Illinois River Holdings Inc; 2003-11-17 to 2004-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Ozinga Materials Inc → Ozinga Materials Inc (Main Pit); 2004-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ozinga Bros Incorporated → Ozinga Materials Inc (Main 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