# Relationship history for MSHA mine 1401692

Current hierarchy: **Greeley County-KS → Greeley County Road Department → Portable Screen #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:** Greeley County Road Department → Portable Screen #1; 2008-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greeley County-KS → Portable Screen #1; 2008-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greeley County-KS → Greeley County Road Department; 2008-08-25 to current/open; source msha-controller-operator-history