# Relationship history for MSHA mine 3901542

Current hierarchy: **Joel J  Koustrup → Koustrup Gravel LLC → Koustrup Gravel LLC**

- 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:** Koustrup Gravel LLC → Koustrup Gravel LLC; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel J  Koustrup → Koustrup Gravel LLC; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel J  Koustrup → Koustrup Gravel LLC; 2009-06-16 to current/open; source msha-controller-operator-history