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Louis F. Polk, left, president of the Sheffield Corp of Dayton, Ohio, presents a group of four early models of gauges and precision instruments to Dr. Alexander Wetmore, center, secretary of the Smithsonian Institute, July 16, 1945. Lt. Gen. Levin H. Campbell Jr., U.S. Army chief of ordnance, looks on at right. Presentation took place at the Smithsonian in Washington, D.C. (AP Photo/Herbert K. White)