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Kay McNulty , Betty Jennings , Betty Snyder , Marlyn Meltzer , Fran Bilas , and Ruth Lichterman were the first programmers of the ENIAC, though their work was not widely recognized for over 50 years. At the time, the hardware was seen as the primary innovation and the complexity of programming the machine was undervalued, perhaps because the first programmers were all women. Historians had at first mistaken them for "Refrigerator Ladies", . models posing in front of the machine.  Most of the women did not receive recognition for their work on the ENIAC in their lifetimes.  50 years after the invention of the ENIAC most of the female programmers were not invited to the 50th anniversary event.