# Relationship history for MSHA mine 3901364

Current hierarchy: **Eldon D  Hagen → Hagen Rock & Gravel Company → SCREENING UNIT NO 2**

- 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:** Eldon D  Hagen → SCREENING UNIT NO 2; 1985-05-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hagen Rock & Gravel Company → SCREENING UNIT NO 2; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eldon D  Hagen → Hagen Rock & Gravel Company; 1988-05-01 to current/open; source msha-controller-operator-history