# Relationship history for MSHA mine 0504743

Current hierarchy: **Delta County-Co → Delta County Commissioners → Delta County District #4 Wash 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Delta County-Co → Delta County District #4 Wash Plant; 1985-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delta County Commissioners → Delta County District #4 Wash Plant; 2002-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delta County-Co → Delta County Commissioners; 2002-03-27 to current/open; source msha-controller-operator-history