# Relationship history for MSHA mine 2103935

Current hierarchy: **Blair J Raitz → Northern Lines Contracting Inc → NLC 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Northern Lines Contracting Inc → NLC Screen; 2018-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blair J Raitz → NLC Screen; 2018-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair J Raitz → Northern Lines Contracting Inc; 2018-08-27 to current/open; source msha-controller-operator-history