# Relationship history for MSHA mine 3304307

Current hierarchy: **Legu Inc → Complete Resources/Darby Materials → DARBY MATERIALS**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Darby Gravel Company → DARBY MATERIALS; 1993-10-01 to 1995-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Louis  Johnson  et al → DARBY MATERIALS; 1993-10-01 to 1995-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Louis  Johnson  et al → Darby Gravel Company; 1993-10-01 to 1995-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Complete Resources/Darby Materials → DARBY MATERIALS; 1995-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Legu Inc → DARBY MATERIALS; 1995-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legu Inc → Complete Resources/Darby Materials; 1995-05-12 to current/open; source msha-controller-operator-history