# Relationship history for MSHA mine 4602286

Current hierarchy: **Rogers A C → Roger Brothers Construction Company → B Seam Strip Job**

- 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:** Roger Brothers Construction Company → B Seam Strip Job; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers A C → B Seam Strip Job; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers A C → Roger Brothers Construction Company; 1950-01-01 to current/open; source msha-controller-operator-history