# Relationship history for MSHA mine 2103952

Current hierarchy: **Derik M  Sabin; Anthony R  Novak → SBS Blacktop Service Inc → SBS Shop Plant**

- 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:** SBS Blacktop Service Inc → SBS Shop Plant; 2019-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derik M  Sabin et al → SBS Shop Plant; 2019-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derik M  Sabin et al → SBS Blacktop Service Inc; 2019-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony R  Novak et al → SBS Blacktop Service Inc; 2019-07-23 to current/open; source msha-controller-operator-history