DeJonge and Co. v. Breuker & Kessler Co.
DeJonge and Co. v. Breuker & Kessler Co., 235 U.S. 33 (1914), was a United States Supreme Court case in which the Court held every instance of a copyrighted work must observe copyright notice formalities for the work to maintain copyright, even if the work appears multiple times on the same sheet of paper. Every copy of a copyrighted painting must bear the notice for the painting to maintain copyright.

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1914 in United States case law
United States copyright case law
United States Supreme Court cases
United States Supreme Court cases of the White Court