# Relationship history for MSHA mine 4500995

Current hierarchy: **CRH PLC → Central Pre-Mix Concrete Company → Yakima Crusher**

- 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:** Central Pre-Mix Concrete Company → Yakima Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Yakima Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Central Pre-Mix Concrete Company; 1950-01-01 to current/open; source msha-controller-operator-history