6 images. University of Southern California School of Dentistry, 11 March 1954. Doctor Rex Ingraham (Head of Department of Operative Dentistry); General views.; Caption slip reads: "Sunday. Photographer: Monteverde. Date: 03-11. Reporter: Dunn. Assignment: U.S.C. School of Dentistry. 84/85: Dr. Rex Ingraham, head of Department of Operative Dentistry, illustrates new-type grinding (high-speed) dental intruments on dummy head, using a Tachometer. 43-44: Same with Ingraham using hi speed drill on model, called Josephine. In foreground on table are diamond instruments. 15-16: Closeup showing wheel on teeth".