# Relationship history for MSHA mine 1514450

Current hierarchy: **Smith Bradley E → Can Do Stoker Inc → No 1 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

- **controller_controls_mine:** Smith Bradley E → No 1 Surface; 1981-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Can Do Stoker Inc → No 1 Surface; 1984-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Bradley E → Can Do Stoker Inc; 1984-02-01 to current/open; source msha-controller-operator-history