You searched for: Issue Dates April 1951 Remove constraint Issue Dates: April 1951 Product Keywords butter Remove constraint Product Keywords: butter Collections Foods, 1940-1966 Remove constraint Collections: Foods, 1940-1966 Defendants C. A. Swanson & Sons, Inc. Remove constraint Defendants: C. A. Swanson & Sons, Inc. Titles 16819. Adulteration of butter. U. S. v. 11 Cases. Remove constraint Titles: 16819. Adulteration of butter. U. S. v. 11 Cases.