# Relationship history for MSHA mine 2602717

Current hierarchy: **James C  Chisum → Yerington Readymix → Yerington Readymix Plant**

- 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 Readymix → Yerington Readymix Plant; 2012-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James C  Chisum → Yerington Readymix Plant; 2012-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Chisum → Yerington Readymix; 2012-06-06 to current/open; source msha-controller-operator-history