# Relationship history for MSHA mine 0202530

Current hierarchy: **De Hoff Emmett J → Unity Properties Inc → Black Eagle**

- 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:** Unity Properties Inc → Black Eagle; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Hoff Emmett J → Black Eagle; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Hoff Emmett J → Unity Properties Inc; 1990-07-01 to current/open; source msha-controller-operator-history