# Relationship history for MSHA mine 3003133

Current hierarchy: **John  Zupan → Nick W Zupan & Sons Inc → ZUPAN GRAVEL BED**

- 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:** Nick W Zupan & Sons Inc → ZUPAN GRAVEL BED; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Zupan → ZUPAN GRAVEL BED; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Zupan → Nick W Zupan & Sons Inc; 1994-09-01 to current/open; source msha-controller-operator-history