# Relationship history for MSHA mine 3610446

Current hierarchy: **Ray A  Darby → R.S.SERVICES → S190**

- 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:** Ray A  Darby → S190; 2009-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R.S.Services → S190; 2024-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray A  Darby → R.S.Services; 2024-06-09 to current/open; source msha-controller-operator-history