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Greyhouse racing patent, 1933. Artwork of a harness and support designed by Renfro Rennie that allows a small animal (such as a monkey) to sit as a jockey on the back of a greyhound. Monkey jockeys were used for a brief period in America and Australia during the 1930s. (KEYSTONE/SCIENCE PHOTO LIBRARY/US PATENT AND TRADEMARK OFFICE/SCIENCE PHOTO LIBRARY)