# Relationship history for MSHA mine 3610341

Current hierarchy: **Robert George  Koval → MOUNTAINEER MINING CORPORATION → LANGLEY MINE**

- 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 → LANGLEY MINE; 1995-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountaineer Mining Corporation → LANGLEY MINE; 2020-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert George  Koval → Mountaineer Mining Corporation; 2020-08-06 to current/open; source msha-controller-operator-history