# Relationship history for MSHA mine 3609872

Current hierarchy: **James T  O'Hara → O'Hara Samson Natural Stone LLC → Shirvan 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James T  O'Hara et al → Shirvan Quarry; 2006-01-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** O'Hara Samson Natural Stone LLC → Shirvan Quarry; 2010-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James T  O'Hara et al → O'Hara Samson Natural Stone LLC; 2010-08-11 to current/open; source msha-controller-operator-history