# Relationship history for MSHA mine 4500730

Current hierarchy: **CRH PLC → American Rock Products, Inc. → Pasco Facility**

- 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 Co. → Pasco Facility; 1950-01-01 to 2015-01-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Pasco Facility; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Central Pre-Mix Concrete Co.; 1950-01-01 to 2015-01-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Pasco Facility; 1987-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Pasco Facility; 2001-09-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Rock Products, Inc. → Pasco Facility; 2015-01-14 to 2018-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → American Rock Products, Inc.; 2015-01-14 to 2018-03-31; source msha-controller-operator-history
- **operator_operates_mine:** American Rock Products, Inc. → Pasco Facility; 2018-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → American Rock Products, Inc.; 2018-04-01 to current/open; source msha-controller-operator-history