# Relationship history for MSHA mine 5400284

Current hierarchy: **Rosado Frank & Erik A → Guaraguao Sand & Gravel Inc → Guaraguao Sand & 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Rosado Frank & Erik A → Guaraguao Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Guaraguao Sand & Gravel Inc → Guaraguao Sand & Gravel; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rosado Frank & Erik A → Guaraguao Sand & Gravel Inc; 1985-10-01 to current/open; source msha-controller-operator-history