# Relationship history for MSHA mine 3606564

Current hierarchy: **Benack Arnold → Large Coal Company Inc → Large Strip**

- 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

- **controller_controls_mine:** Benack Arnold → Large Strip; 1976-11-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Large Coal Company Inc → Large Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benack Arnold → Large Coal Company Inc; 1977-11-01 to current/open; source msha-controller-operator-history