# Relationship history for MSHA mine 3503966

Current hierarchy: **CRH PLC → RiverBend Materials → Umpqua Mobile Crushing**

- 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 → Umpqua Mobile Crushing; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly J  Guido et al → Umpqua Mobile Crushing; 2012-09-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Quarries → Umpqua Mobile Crushing; 2024-08-22 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Kelly J  Guido et al → Umpqua Quarries; 2024-08-22 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Mona  Guido et al → Umpqua Quarries; 2024-08-22 to 2025-04-03; source msha-controller-operator-history
- **operator_operates_mine:** RiverBend Materials → Umpqua Mobile Crushing; 2025-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → RiverBend Materials; 2025-04-04 to current/open; source msha-controller-operator-history