# Relationship history for MSHA mine 3500484

Current hierarchy: **CRH PLC → River Bend Materials → RiverBend Materials North Pit**

- 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

- **operator_operates_mine:** Eugene Sand & Gravel Inc → RiverBend Materials North Pit; 1950-01-01 to 2007-07-29; source msha-controller-operator-history
- **controller_controls_mine:** John  Alltucker et al → RiverBend Materials North Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Alltucker et al → Eugene Sand & Gravel Inc; 1950-01-01 to 2007-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Alltucker et al → Eugene Sand & Gravel Inc; 1950-01-01 to 2007-07-29; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → RiverBend Materials North Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Materials → RiverBend Materials North Pit; 2007-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → River Bend Materials; 2007-07-30 to current/open; source msha-controller-operator-history