# Relationship history for MSHA mine 4702284

Current hierarchy: **Oconto County-WI → Oconto County Highway Department → Blazek 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:** Oconto County Highway Department → Blazek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oconto County-WI → Blazek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oconto County-WI → Oconto County Highway Department; 1950-01-01 to current/open; source msha-controller-operator-history