# Relationship history for MSHA mine 3503326

Current hierarchy: **Lake County-Or → Lake County Road Department → SOUTH COUNTY 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

- **operator_operates_mine:** Lake County Road Department → SOUTH COUNTY QUARRY; 1988-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lake County-Or → SOUTH COUNTY QUARRY; 1988-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lake County-Or → Lake County Road Department; 1988-12-01 to current/open; source msha-controller-operator-history