# Relationship history for MSHA mine 0502142

Current hierarchy: **Arrigo Milling & Mining → Arrigo Milling & Mining → Yukon Mill**

- 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:** Choctaw Mining Company → Yukon Mill; 1950-01-01 to 1982-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Vann John Rush → Yukon Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vann John Rush → Choctaw Mining Company; 1950-01-01 to 1982-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Arrigo Milling & Mining → Yukon Mill; 1982-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arrigo Milling & Mining → Yukon Mill; 1982-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arrigo Milling & Mining → Arrigo Milling & Mining; 1982-12-21 to current/open; source msha-controller-operator-history