# Relationship history for MSHA mine 2700379

Current hierarchy: **CRH PLC → Pike Industries Inc → VIPER-Portable 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 → VIPER-Portable Screen; 1988-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lloyd A  Drew → VIPER-Portable Screen; 1998-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** COLUMBIA SAND & GRAVEL → VIPER-Portable Screen; 2002-08-06 to 2011-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd A  Drew → COLUMBIA SAND & GRAVEL; 2002-08-06 to 2011-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Pike Industries Inc → VIPER-Portable Screen; 2011-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pike Industries Inc; 2011-06-29 to current/open; source msha-controller-operator-history