# Relationship history for MSHA mine 4606164

Current hierarchy: **Garbart Paul E → Alyeska Inc → White Rock Quarry And Plant**

- 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:** Alyeska Inc → White Rock Quarry And Plant; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Garbart Paul E → White Rock Quarry And Plant; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garbart Paul E → Alyeska Inc; 1980-04-01 to current/open; source msha-controller-operator-history