# Relationship history for MSHA mine 1401785

Current hierarchy: **Dean  Luckeroth → Nemaha Sand & Gravel inc. → Roper 1**

- 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:** Dean  Luckeroth → Roper 1; 2002-04-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nemaha Sand & Gravel inc. → Roper 1; 2017-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Luckeroth → Nemaha Sand & Gravel inc.; 2017-05-09 to current/open; source msha-controller-operator-history