# Relationship history for MSHA mine 2402708

Current hierarchy: **Donald R  Ferguson → Millennium Construction & Consulting, Inc. → Millennium 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Millennium Construction & Consulting, Inc. → Millennium Materials; 2017-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Ferguson → Millennium Materials; 2017-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Ferguson → Millennium Construction & Consulting, Inc.; 2017-03-30 to current/open; source msha-controller-operator-history