# Relationship history for MSHA mine 3401628

Current hierarchy: **Smith Paul G → Independent Soil Bank → Independent Soil Bank**

- 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:** Independent Soil Bank → Independent Soil Bank; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Paul G → Independent Soil Bank; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Paul G → Independent Soil Bank; 1987-08-01 to current/open; source msha-controller-operator-history