# Relationship history for MSHA mine 4703903

Current hierarchy: **Karlee  Mann; Dexter  Mann; Afton  Isler → SNL Excavation, LLC → Wash Plant #1**

- 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:** SNL Excavation, LLC → Wash Plant #1; 2021-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Afton  Isler et al → Wash Plant #1; 2021-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Afton  Isler et al → SNL Excavation, LLC; 2021-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dexter  Mann et al → SNL Excavation, LLC; 2021-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karlee  Mann et al → SNL Excavation, LLC; 2021-06-30 to current/open; source msha-controller-operator-history