# Relationship history for MSHA mine 3501064

Current hierarchy: **CRH PLC → River Bend Materials → RiverBend Materials Coburg**

- 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 → RiverBend Materials Coburg; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Egge Sand & Gravel Llc → RiverBend Materials Coburg; 1950-01-01 to 2007-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Vernon L  Egge → RiverBend Materials Coburg; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernon L  Egge → Egge Sand & Gravel Llc; 1950-01-01 to 2007-03-28; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Materials → RiverBend Materials Coburg; 2007-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → River Bend Materials; 2007-03-29 to current/open; source msha-controller-operator-history