# Relationship history for MSHA mine 0103580

Current hierarchy: **Thomas Matthew  Arrington → ARRINGTON CURB & EXCAVATION, INC → PREVO SAND**

- 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:** Prevo Sand & Gravel LLC → PREVO SAND; 2023-04-01 to 2025-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Waymond  Nettles → PREVO SAND; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waymond  Nettles → Prevo Sand & Gravel LLC; 2023-04-01 to 2025-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Arrington Curb & Excavation, Inc → PREVO SAND; 2025-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Matthew  Arrington → PREVO SAND; 2025-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Matthew  Arrington → Arrington Curb & Excavation, Inc; 2025-07-02 to current/open; source msha-controller-operator-history