# Relationship history for MSHA mine 4602836

Current hierarchy: **Stewart Brent → S Brent Stewart Inc → No 1 Mine Surface**

- 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:** S Brent Stewart Inc → No 1 Mine Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stewart Brent → No 1 Mine Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stewart Brent → S Brent Stewart Inc; 1950-01-01 to current/open; source msha-controller-operator-history