# Relationship history for MSHA mine 4105691

Current hierarchy: **Ruben  Garza → Sandy Oak Materials, LLC → Sandy Oak Materials**

- 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:** Sandy Oak Materials, LLC → Sandy Oak Materials; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruben  Garza → Sandy Oak Materials; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Garza → Sandy Oak Materials, LLC; 2023-06-01 to current/open; source msha-controller-operator-history