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Based on limited metadata, this Warning Letter was issued to Zeller Power Products, LLC, a medical device manufacturer, on May 9, 2019. Without access to the full letter text or specific subject line, the exact nature of the violations cannot be determined from the available information. The letter falls under FDA's medical device regulatory authority, though the specific issuing office is unknown. To understand the complete compliance concerns and required corrective actions, the full Warning Letter text would be necessary.