# Relationship history for MSHA mine 2003570

Current hierarchy: **Jeff  Burrell → Target Trucking LLC → Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jeff  Burrell → Portable Screen; 2015-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Target Trucking LLC → Portable Screen; 2018-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Burrell → Target Trucking LLC; 2018-10-14 to current/open; source msha-controller-operator-history