# Relationship history for MSHA mine 3500593

Current hierarchy: **CRH PLC → River Bend Materials → UMPQUA SAND & GRAVEL 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Umpqua Sand & Gravel → UMPQUA SAND & GRAVEL PIT; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Mona  Guido et al → UMPQUA SAND & GRAVEL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mona  Guido et al → Umpqua Sand & Gravel; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Kelly J  Guido et al → Umpqua Sand & Gravel; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → UMPQUA SAND & GRAVEL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Sand & Gravel Company → UMPQUA SAND & GRAVEL PIT; 1979-10-30 to 1985-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Brandt Berkeley Jr Family Trust → UMPQUA SAND & GRAVEL PIT; 1979-10-30 to 1985-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Brandt Berkeley Jr Family Trust → Umpqua Sand & Gravel Company; 1979-10-30 to 1985-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Sand & Gravel → UMPQUA SAND & GRAVEL PIT; 1985-02-27 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Kelly J  Guido et al → Umpqua Sand & Gravel; 1985-02-27 to 2025-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Mona  Guido et al → Umpqua Sand & Gravel; 1985-02-27 to 2025-04-03; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Materials → UMPQUA SAND & GRAVEL PIT; 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