# Relationship history for MSHA mine 4500604

Current hierarchy: **CRH PLC → Interstate Concrete & Asphalt Company → Interstate Concrete and Asphalt-Hawkins**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Colville Valley Concrete Corp → Interstate Concrete and Asphalt-Hawkins; 1950-01-01 to 2019-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Steven  Connelly → Interstate Concrete and Asphalt-Hawkins; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Connelly → Colville Valley Concrete Corp; 1950-01-01 to 2019-08-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Interstate Concrete and Asphalt-Hawkins; 1987-09-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Concrete & Asphalt Company → Interstate Concrete and Asphalt-Hawkins; 2019-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Interstate Concrete & Asphalt Company; 2019-08-16 to current/open; source msha-controller-operator-history