# Relationship history for MSHA mine 3610307

Current hierarchy: **Robert George  Koval → Mountaineering Mining Corporation → Ferko 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Robert George  Koval → Ferko Strip; 1995-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountaineering Mining Corporation → Ferko Strip; 2019-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert George  Koval → Mountaineering Mining Corporation; 2019-09-26 to current/open; source msha-controller-operator-history