The studio that was known as MGM/UA for a short time released the 83rd one-real animated short on this date?
Little School Mouse:  The cartoon was animated by Irven Spence and Ed Barge, with backgrounds by Robert Gentle, and released on May 29, 1954 by Metro-Goldwyn-Mayer. Metro-Goldwyn-Mayer: Metro-Goldwyn-Mayer Studios Inc. (abbreviated as MGM or M-G-M, also known as Metro-Goldwyn-Mayer Pictures, Metro-Goldwyn-Mayer or simply Metro, and for a former interval known as Metro-Goldwyn-Mayer/United Artists, or MGM/UA) is an American media company, involved primarily in the production and distribution of feature films and television programs.
i don't know