DC legislative assistant Dr. Ralph Miwa with Dr. A. Leonard Diamondapproximately 1960sunknownhttp://rightsstatements.org/vocab/UND/1.0/enghttp://congressarchives.org/record/HCPC_DI_PH11_21-35_003Caption: Dr. A. Leonard Diamond, right, demonstrates his teaching machine to Dr. Ralph M. Miwa, legislative assistant to Senator Daniel K. Inouye. A simple form of the teaching machine is in the center of the picture.