# Relationship history for MSHA mine 2402178

Current hierarchy: **Mineral County-Mt → Mineral County Road Dept → MINERAL COUNTY PORTABLE SCREEN**

- 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:** Mineral County → MINERAL COUNTY PORTABLE SCREEN; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mineral County-Mt → MINERAL COUNTY PORTABLE SCREEN; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mineral County-Mt → Mineral County; 1998-08-01 to current/open; source msha-controller-operator-history