# Relationship history for MSHA mine 3003970

Current hierarchy: **Steuben County-Ny → Steuben Co. Dept of Public Works → 1989 PowerScreen Mark 2 #7201063**

- 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

- **controller_controls_mine:** Steuben County-Ny → 1989 PowerScreen Mark 2 #7201063; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steuben Co. Dept of Public Works → 1989 PowerScreen Mark 2 #7201063; 2016-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steuben County-Ny → Steuben Co. Dept of Public Works; 2016-03-23 to current/open; source msha-controller-operator-history