# Relationship history for MSHA mine 2302473

Current hierarchy: **Shannon County  (MO) → Shannon County Rock Quarry → Site #2**

- 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:** Shannon County Rock Quarry → Site #2; 2014-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shannon County  (MO) → Site #2; 2014-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shannon County  (MO) → Shannon County Rock Quarry; 2014-06-10 to current/open; source msha-controller-operator-history