# Relationship history for MSHA mine 1103213

Current hierarchy: **Ozinga Bros Incorporated → Ozinga Materials Inc → Henry**

- 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:** Ozinga Bros Incorporated → Henry; 2004-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ozinga Materials Inc → Henry; 2009-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ozinga Bros Incorporated → Ozinga Materials Inc; 2009-05-26 to current/open; source msha-controller-operator-history