# Relationship history for MSHA mine 1401750

Current hierarchy: **Brigitte  Lyon; Kelly  Lyon → NCK Quarries LLC → NCK Quarries LLC**

- 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:** NCK Quarries LLC → NCK Quarries LLC; 2012-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Lyon et al → NCK Quarries LLC; 2012-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Lyon et al → NCK Quarries LLC; 2012-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brigitte  Lyon et al → NCK Quarries LLC; 2012-07-25 to current/open; source msha-controller-operator-history