# Relationship history for MSHA mine 4503840

Current hierarchy: **Central Washington Asphalt Inc → AAA Concrete, Inc. → Benton City Wash Plant #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Central Washington Asphalt Inc → Benton City Wash Plant #1; 2021-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AAA Concrete, Inc. → Benton City Wash Plant #1; 2023-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Central Washington Asphalt Inc → AAA Concrete, Inc.; 2023-04-24 to current/open; source msha-controller-operator-history