# Relationship history for MSHA mine 4702261

Current hierarchy: **Taylor County - Wi → Taylor County Highway Department → Black River Pit**

- 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:** Taylor County Highway Department → Black River Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor County - Wi → Black River Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor County - Wi → Taylor County Highway Department; 1950-01-01 to current/open; source msha-controller-operator-history