# Relationship history for MSHA mine 2602909

Current hierarchy: **Stacy  Clark → CLARK AND YOUNG EXCAVATION → Rulco**

- 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:** CLARK AND YOUNG EXCAVATION → Rulco; 2025-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacy  Clark → Rulco; 2025-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy  Clark → CLARK AND YOUNG EXCAVATION; 2025-01-21 to current/open; source msha-controller-operator-history