# Relationship history for MSHA mine 2200699

Current hierarchy: **Jerry K White → Oxford Sand Company Inc → MOBILE WASHER**

- 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:** Jerry K White → MOBILE WASHER; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oxford Sand Company Inc → MOBILE WASHER; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry K White → Oxford Sand Company Inc; 1998-07-01 to current/open; source msha-controller-operator-history