# Relationship history for MSHA mine 1506721

Current hierarchy: **Bolling Vince Jr → Kodak Mining Company Inc → Solo Preparation Plant No 4**

- 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

- **controller_controls_mine:** Bolling Vince Jr → Solo Preparation Plant No 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kodak Mining Company Inc → Solo Preparation Plant No 4; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolling Vince Jr → Kodak Mining Company Inc; 1973-01-01 to current/open; source msha-controller-operator-history