3.- The ENIAC programmers:

The ENIAC (Electronic Numerical Integrator and Computer) was one of the first electronic general-purpose computers made. It was digital and able to solve a large class of numerical problems through reprogramming.
The machine was used during World War II to calculate artillery trajectories.

As there was shortage of male engineers, they hired six women to do the calculations by hand, analysed differential equations and determined how to connect the circuits: Jean Jennings, Marlyn Wescoff, Ruth Lichterman, Betty Snyder, Frances Bilas, and Kay McNulty, were the real programmers and developers of the ENIAC projects.

After the end of the World War the male engineers returned and the original programers of the ENIAC were neither recognized for their efforts, nor known to the public until the 1980s.