# Relationship history for MSHA mine 0504740

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc. → CR6**

- 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:** CRH PLC → CR6; 1998-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc. → CR6; 2002-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc.; 2002-02-22 to current/open; source msha-controller-operator-history