# Relationship history for MSHA mine 5000767

Current hierarchy: **Alyeska Oil & Exploration → Alyeska Pipeline Service Company → 91-3 1 Material Site**

- 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

- **operator_operates_mine:** Alyeska Pipeline Service Company → 91-3 1 Material Site; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alyeska Oil & Exploration → 91-3 1 Material Site; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alyeska Oil & Exploration → Alyeska Pipeline Service Company; 1950-01-01 to current/open; source msha-controller-operator-history