# Relationship history for MSHA mine 3609278

Current hierarchy: **Harry E  Freed → Opal Industries, Inc. → Schreckengost**

- 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:** Harry E  Freed → Schreckengost; 1995-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Opal Industries, Inc. → Schreckengost; 2004-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry E  Freed → Opal Industries, Inc.; 2004-12-01 to current/open; source msha-controller-operator-history