# Relationship history for MSHA mine 0504549

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc. → WP 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:** Bill  Bailey → WP 3; 1992-06-01 to 1999-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Custom Crushing Inc → WP 3; 1994-07-01 to 1999-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Bailey → Custom Crushing Inc; 1994-07-01 to 1999-09-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → WP 3; 1998-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc. → WP 3; 1999-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc.; 1999-09-21 to current/open; source msha-controller-operator-history