# Relationship history for MSHA mine 4703959

Current hierarchy: **Thomas  DeBeck → Four Man Chess LLC → McCloskey RM 155 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Four Man Chess LLC → McCloskey RM 155 Screener; 2024-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  DeBeck → McCloskey RM 155 Screener; 2024-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  DeBeck → Four Man Chess LLC; 2024-05-07 to current/open; source msha-controller-operator-history