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Based on limited metadata, McCallum Manufacturing Ltd received an FDA Warning Letter on April 9, 2018, regarding manufacturing practices or product quality issues, though the specific subject matter and violation details are not available in the provided information. The letter was issued by the FDA but the specific regulatory office and exact number of violations are unknown. Without access to the full warning letter text, the precise nature of the compliance concerns and the product category involved cannot be definitively determined beyond the general classification as "Other" product type.