# Relationship history for MSHA mine 4602670

Current hierarchy: **Polino Contracting Inc → Fairfax Trucking Company → Susan (Charlotte) #1**

- 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:** Fairfax Trucking Company → Susan (Charlotte) #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Polino Contracting Inc → Susan (Charlotte) #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Polino Contracting Inc → Fairfax Trucking Company; 1950-01-01 to current/open; source msha-controller-operator-history