# Relationship history for MSHA mine 3901692

Current hierarchy: **Stacy  Kopman; Dwight  Kopman → Basin Construction & Drain Tile, LLC → Arnold Pit**

- 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:** Dwight  Kopman et al → Arnold Pit; 2016-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Basin Construction & Drain Tile, LLC → Arnold Pit; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwight  Kopman et al → Basin Construction & Drain Tile, LLC; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy  Kopman et al → Basin Construction & Drain Tile, LLC; 2025-05-20 to current/open; source msha-controller-operator-history