# Relationship history for MSHA mine 2002849

Current hierarchy: **John S  Yerington II → Yerington Leasing Company → 50 V Pioneer**

- 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:** Yerington Leasing Company → 50 V Pioneer; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John S  Yerington II → 50 V Pioneer; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John S  Yerington II → Yerington Leasing Company; 1990-09-01 to current/open; source msha-controller-operator-history