# Relationship history for MSHA mine 4104653

Current hierarchy: **Daniel Romualdo  Soto → DRS Rock Materials, LLC → Windmill Quarry**

- 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:** Daniel Romualdo  Soto → Windmill Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DRS Rock Materials, LLC → Windmill Quarry; 2007-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Romualdo  Soto → DRS Rock Materials, LLC; 2007-03-22 to current/open; source msha-controller-operator-history