# Relationship history for MSHA mine 4703478

Current hierarchy: **Timothy L  Zillges → Zillges Materials, Inc. → McCloskey Screen Plant**

- 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:** Zillges Materials, Inc. → McCloskey Screen Plant; 2006-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy L  Zillges → McCloskey Screen Plant; 2006-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy L  Zillges → Zillges Materials, Inc.; 2006-08-22 to current/open; source msha-controller-operator-history