# Relationship history for MSHA mine 3605519

Current hierarchy: **Nyswaner Robert E → Bituminous Processing Company Inc → Wyano Coal Washer**

- 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:** Bituminous Processing Company Inc → Wyano Coal Washer; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nyswaner Robert E → Wyano Coal Washer; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nyswaner Robert E → Bituminous Processing Company Inc; 1975-01-01 to current/open; source msha-controller-operator-history