# Relationship history for MSHA mine 3003747

Current hierarchy: **Kevin  Zielinski → Zielinski's Asphalt → Chieftain Portable Power Screen**

- 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:** Zielinski's Asphalt → Chieftain Portable Power Screen; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Zielinski → Chieftain Portable Power Screen; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Zielinski → Zielinski's Asphalt; 2010-04-15 to current/open; source msha-controller-operator-history