# Relationship history for MSHA mine 4503032

Current hierarchy: **CRH PLC → Inland Asphalt Company → IAC Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** CRH PLC → IAC Portable Crusher; 1983-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inland Asphalt Company → IAC Portable Crusher; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Inland Asphalt Company; 1985-02-01 to current/open; source msha-controller-operator-history