# Relationship history for MSHA mine 0301719

Current hierarchy: **Unruh Ivan → Russ & Sons Inc → Mine #2**

- 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

- **controller_controls_mine:** Unruh Ivan → Mine #2; 1985-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Russ & Sons Inc → Mine #2; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Unruh Ivan → Russ & Sons Inc; 1991-06-01 to current/open; source msha-controller-operator-history