# Relationship history for MSHA mine 0600723

Current hierarchy: **CRH PLC → Tilcon Connecticut, Inc. → Power Screen Warrior**

- 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 → Power Screen Warrior; 1996-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Connecticut, Inc. → Power Screen Warrior; 2005-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon Connecticut, Inc.; 2005-04-07 to current/open; source msha-controller-operator-history