# Relationship history for MSHA mine 3003681

Current hierarchy: **Lawrence  Barrego → Lake Street Granite Quarry → Lake Street Granite 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:** Lawrence  Barrego → Lake Street Granite Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lake Street Granite Quarry → Lake Street Granite Quarry; 2009-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Barrego → Lake Street Granite Quarry; 2009-05-18 to current/open; source msha-controller-operator-history