# Relationship history for MSHA mine 3003741

Current hierarchy: **Teresa  Borwegen → Borwegen Excavation & Repair Inc → Power Screen 720 Tromell**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Borwegen Excavation & Repair Inc → Power Screen 720 Tromell; 2010-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teresa  Borwegen → Power Screen 720 Tromell; 2010-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teresa  Borwegen → Borwegen Excavation & Repair Inc; 2010-02-16 to current/open; source msha-controller-operator-history