# Relationship history for MSHA mine 4104369

Current hierarchy: **Daniel Romualdo  Soto → D R S  Rock Materials, LLC → D. S. 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

- **operator_operates_mine:** D R S  Rock Materials, LLC → D. S. QUARRY; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Romualdo  Soto → D. S. QUARRY; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Romualdo  Soto → D R S  Rock Materials, LLC; 2002-05-29 to current/open; source msha-controller-operator-history