# Relationship history for MSHA mine 3608618

Current hierarchy: **Harry E  Freed → Opal Industries Inc → Skapura 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Opal Industries Inc → Skapura Mine; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harry E  Freed → Skapura Mine; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry E  Freed → Opal Industries Inc; 1995-05-01 to current/open; source msha-controller-operator-history