# Relationship history for MSHA mine 0202450

Current hierarchy: **CRH PLC → Young Block Company → Young Block 1**

- 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:** Thomas P  Young → Young Block 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Young Block Company Inc → Young Block 1; 1988-04-01 to 1999-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Thomas P  Young → Young Block Company Inc; 1988-04-01 to 1999-01-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Young Block 1; 1989-05-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Young Block Company → Young Block 1; 1999-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Young Block Company; 1999-01-13 to current/open; source msha-controller-operator-history