# Relationship history for MSHA mine 3002709

Current hierarchy: **Nancy  O'Brien → New York Quarries Inc → Lime Rock Quarry**

- 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

- **controller_controls_mine:** Nancy  O'Brien → Lime Rock Quarry; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New York Quarries Inc → Lime Rock Quarry; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  O'Brien → New York Quarries Inc; 1985-10-01 to current/open; source msha-controller-operator-history