# Relationship history for MSHA mine 2602892

Current hierarchy: **Donald  Emborsky; Brandon  Longe → Nevada Aggregates → Fernley Quarry**

- 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:** Nevada Aggregates → Fernley Quarry; 2023-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Emborsky et al → Fernley Quarry; 2023-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Emborsky et al → Nevada Aggregates; 2023-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brandon  Longe et al → Nevada Aggregates; 2023-02-22 to current/open; source msha-controller-operator-history