# Relationship history for MSHA mine 4502205

Current hierarchy: **CRH PLC → Central Pre-Mix Concrete Company → Mead Pre-Mix #3**

- 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

- **controller_controls_mine:** Donald H  Herak → Mead Pre-Mix #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Pre-Mix Concrete Company → Mead Pre-Mix #3; 1950-01-01 to 1983-01-18; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mead Pre-Mix #3; 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 1983-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Acme Concrete Company → Mead Pre-Mix #3; 1983-01-19 to 1984-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Donald H  Herak → Acme Concrete Company; 1983-01-19 to 1984-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Central Pre-Mix Concrete Company → Mead Pre-Mix #3; 1984-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Central Pre-Mix Concrete Company; 1984-09-13 to current/open; source msha-controller-operator-history