# Relationship history for MSHA mine 1601520

Current hierarchy: **A W  O'Quinn Jr → American Sand and Gravel, LLC → Hwy 1019 Plant**

- 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:** American Sand and Gravel, L.L.C. → Hwy 1019 Plant; 2011-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** A W  O'Quinn Jr → Hwy 1019 Plant; 2011-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A W  O'Quinn Jr → American Sand and Gravel, L.L.C.; 2011-09-26 to current/open; source msha-controller-operator-history