# Relationship history for MSHA mine 3002870

Current hierarchy: **Steuben County-Ny → Steuben County-Department Of Public Works → SAUERBRIER 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

- **controller_controls_mine:** Steuben County-Ny → SAUERBRIER PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steuben County-Department Of Public Works → SAUERBRIER PIT; 1988-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steuben County-Ny → Steuben County-Department Of Public Works; 1988-12-01 to current/open; source msha-controller-operator-history