# Relationship history for MSHA mine 2003451

Current hierarchy: **Matthew  Beckman → Beckman Brothers Inc → T-Sab Screener**

- 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:** Robert W  Beckman → T-Sab Screener; 1950-01-01 to 2023-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Beckman Brothers Inc → T-Sab Screener; 2011-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Beckman → Beckman Brothers Inc; 2011-05-10 to 2023-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Beckman → T-Sab Screener; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Beckman → Beckman Brothers Inc; 2023-04-01 to current/open; source msha-controller-operator-history