# Relationship history for MSHA mine 3607765

Current hierarchy: **Irene  Savitski → Savitski Brothers Coal Sales → Savitski Bros Strip No 1**

- 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:** Savitski Brothers Coal Sales → Savitski Bros Strip No 1; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Irene  Savitski → Savitski Bros Strip No 1; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irene  Savitski → Savitski Brothers Coal Sales; 1985-12-01 to current/open; source msha-controller-operator-history