# Relationship history for MSHA mine 1515924

Current hierarchy: **Brown Douglas E → Wolf Creek Mining Inc → Sullivan Mine**

- 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:** Brown Douglas E → Sullivan Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Creek Mining Inc → Sullivan Mine; 1987-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Douglas E → Wolf Creek Mining Inc; 1987-02-01 to current/open; source msha-controller-operator-history