# Relationship history for MSHA mine 4105660

Current hierarchy: **Tatiana  Golovina → ZD Sand, LLC → ZD Sand**

- 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:** ZD Sand, LLC → ZD Sand; 2022-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tatiana  Golovina → ZD Sand; 2022-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tatiana  Golovina → ZD Sand, LLC; 2022-12-28 to current/open; source msha-controller-operator-history