# Relationship history for MSHA mine 2402546

Current hierarchy: **Zachery David  Anderson → Anderson Masonry Inc → Thompson Lake 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:** Zachery David  Anderson → Thompson Lake Quarry; 2004-02-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anderson Masonry Inc → Thompson Lake Quarry; 2009-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachery David  Anderson → Anderson Masonry Inc; 2009-05-01 to current/open; source msha-controller-operator-history