# Relationship history for MSHA mine 2103688

Current hierarchy: **Leonard G  Thelen → Thelen Excavating → Wash 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:** Thelen Excavating → Wash Screen; 2009-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard G  Thelen → Wash Screen; 2009-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard G  Thelen → Thelen Excavating; 2009-11-09 to current/open; source msha-controller-operator-history