# Relationship history for MSHA mine 2302607

Current hierarchy: **Steve  Stephan; Clay  Stephan → Stephan Brothers Trucking → Stephan #1**

- 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:** Stephan Brothers Trucking → Stephan #1; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clay  Stephan et al → Stephan #1; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clay  Stephan et al → Stephan Brothers Trucking; 2026-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Stephan et al → Stephan Brothers Trucking; 2026-03-31 to current/open; source msha-controller-operator-history