# Relationship history for MSHA mine 2200765

Current hierarchy: **Nicholas K  Vlahos → Mississippi Rocks, Inc. → Columbia #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mississippi Rocks, Inc. → Columbia #1; 2006-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas K  Vlahos → Columbia #1; 2006-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas K  Vlahos → Mississippi Rocks, Inc.; 2006-01-02 to current/open; source msha-controller-operator-history