# Relationship history for MSHA mine 4703733

Current hierarchy: **Brown County-WI → BROWN COUNTY PUBLIC WORKS → CHIEFTAIN POWER 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:** Brown County Public Works → CHIEFTAIN POWER SCREEN; 2014-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown County-WI → CHIEFTAIN POWER SCREEN; 2014-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown County-WI → Brown County Public Works; 2014-09-17 to current/open; source msha-controller-operator-history