# Relationship history for MSHA mine 3610172

Current hierarchy: **Duane M Hull → Hull Excavating → Kolberg Screen**

- 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:** Hull Excavating → Kolberg Screen; 2016-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duane M Hull → Kolberg Screen; 2016-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane M Hull → Hull Excavating; 2016-03-22 to current/open; source msha-controller-operator-history