# Relationship history for MSHA mine 4003342

Current hierarchy: **Johnson County-TN → Johnson County Highway Department → Roan Valley Plant**

- 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:** Johnson County Highway Department → Roan Valley Plant; 2009-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson County-TN → Roan Valley Plant; 2009-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson County-TN → Johnson County Highway Department; 2009-02-24 to current/open; source msha-controller-operator-history