# Relationship history for MSHA mine 4003431

Current hierarchy: **Avery C  York III → York & Sons Quarries → Turner 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:** Avery C  York III → Turner Quarry; 2009-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** York & Sons Quarries → Turner Quarry; 2012-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Avery C  York III → York & Sons Quarries; 2012-12-17 to current/open; source msha-controller-operator-history