# Relationship history for MSHA mine 3500631

Current hierarchy: **CRH PLC → RiverBend Materials → RiverBend Materials Dalton**

- 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:** J C Compton Company → RiverBend Materials Dalton; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** La Creole Lumber & Rock Company Inc → RiverBend Materials Dalton; 1950-01-01 to 1993-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Andrew  Lalack → RiverBend Materials Dalton; 1950-01-01 to 1993-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Lalack → La Creole Lumber & Rock Company Inc; 1950-01-01 to 1993-04-21; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → RiverBend Materials Dalton; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley Concrete & Gravel Company → RiverBend Materials Dalton; 1993-04-22 to 2006-06-30; source msha-controller-operator-history
- **controller_controls_operator:** J C Compton Company → Valley Concrete & Gravel Company; 1993-04-22 to 2006-06-30; source msha-controller-operator-history
- **operator_operates_mine:** RiverBend Materials → RiverBend Materials Dalton; 2006-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → RiverBend Materials; 2006-07-01 to current/open; source msha-controller-operator-history