# Relationship history for MSHA mine 2700477

Current hierarchy: **CRH PLC → Pike Industries, Inc. → Portable Read Screen**

- 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 → Portable Read Screen; 1988-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries, Inc. → Portable Read Screen; 2013-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pike Industries, Inc.; 2013-09-26 to current/open; source msha-controller-operator-history