# Relationship history for MSHA mine 3004005

Current hierarchy: **Charles D Woodruff → Woodruff Construction → Woodruff Gravel**

- 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:** Woodruff Construction → Woodruff Gravel; 2017-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles D Woodruff → Woodruff Gravel; 2017-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D Woodruff → Woodruff Construction; 2017-11-06 to current/open; source msha-controller-operator-history