# Relationship history for MSHA mine 4402921

Current hierarchy: **Bryant Samuel T → S T Bryant → No 1 Dredge & Mill**

- 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 T Bryant → No 1 Dredge & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryant Samuel T → No 1 Dredge & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryant Samuel T → S T Bryant; 1950-01-01 to current/open; source msha-controller-operator-history