# Relationship history for MSHA mine 2602526

Current hierarchy: **Mike  Wilson; John H Chase → Nevada Crushing & Screening Co Inc → Extec/Pegison Portable**

- 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 Crushing & Screening Co Inc → Extec/Pegison Portable; 2003-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Wilson et al → Extec/Pegison Portable; 2003-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Wilson et al → Nevada Crushing & Screening Co Inc; 2003-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H Chase et al → Nevada Crushing & Screening Co Inc; 2003-10-14 to current/open; source msha-controller-operator-history