# Relationship history for MSHA mine 3004107

Current hierarchy: **Scott David Polaro → POLARO SAND & GRAVEL INC → ROUTE 351 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Polaro Sand & Gravel Inc → ROUTE 351 PIT; 2022-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott David Polaro → ROUTE 351 PIT; 2022-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott David Polaro → Polaro Sand & Gravel Inc; 2022-12-04 to current/open; source msha-controller-operator-history