# Relationship history for MSHA mine 2602539

Current hierarchy: **Ralph E  Pray → Nevada Iron → Kublai Khan**

- 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

- **operator_operates_mine:** Nevada Iron → Kublai Khan; 2004-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph E  Pray → Kublai Khan; 2004-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph E  Pray → Nevada Iron; 2004-05-12 to current/open; source msha-controller-operator-history