# Relationship history for MSHA mine 3304080

Current hierarchy: **Roush David D → D & J Energy Inc → D & J Strip**

- 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

- **controller_controls_mine:** Roush David D → D & J Strip; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & J Energy Inc → D & J Strip; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roush David D → D & J Energy Inc; 1987-01-01 to current/open; source msha-controller-operator-history