# Relationship history for MSHA mine 3800755

Current hierarchy: **Fredrick  Mixson → M2-Sandworks, LLC → Sandworks**

- 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:** M2-Sandworks, LLC → Sandworks; 2020-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fredrick  Mixson → Sandworks; 2020-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fredrick  Mixson → M2-Sandworks, LLC; 2020-02-12 to current/open; source msha-controller-operator-history