# Relationship history for MSHA mine 3002850

Current hierarchy: **Donald  Snow → Don Snow Trucking Inc → Winsor 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:** Don Snow Trucking Inc → Winsor Pit; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Snow → Winsor Pit; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Snow → Don Snow Trucking Inc; 1988-07-01 to current/open; source msha-controller-operator-history