# Relationship history for MSHA mine 3503782

Current hierarchy: **CRH PLC → River Bend Materials → Portable Plant**

- 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 → Portable Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Quarries,LLC → Portable Plant; 2012-09-06 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Kelly J  Guido et al → Portable Plant; 2012-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly J  Guido et al → Umpqua Quarries,LLC; 2012-09-06 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Mona  Guido et al → Umpqua Quarries,LLC; 2012-09-06 to 2025-04-03; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Materials → Portable Plant; 2025-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → River Bend Materials; 2025-04-04 to current/open; source msha-controller-operator-history