# Relationship history for MSHA mine 3004174

Current hierarchy: **Timothy E  Lutgen → Maple Springs Gravel Products Inc. → Carlson Gravel Mine**

- 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:** Maple Springs Gravel Products Inc. → Carlson Gravel Mine; 2026-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy E  Lutgen → Carlson Gravel Mine; 2026-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy E  Lutgen → Maple Springs Gravel Products Inc.; 2026-03-18 to current/open; source msha-controller-operator-history