# Relationship history for MSHA mine 3200917

Current hierarchy: **Jamar → J Koski Company → Koski Screener**

- 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:** J Koski Company → Koski Screener; 2011-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jamar → Koski Screener; 2011-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamar → J Koski Company; 2011-09-29 to current/open; source msha-controller-operator-history