One way to test that claim is to look at e.g. who worked at Xerox Parc in the 1970s:<p><a href="https://en.wikipedia.org/wiki/List_of_people_associated_with_PARC" rel="nofollow">https://en.wikipedia.org/wiki/List_of_people_associated_with...</a>
If you're interested in the history of how women got pushed out of computing, you should also check out Programmed Inequality by Marie Hicks as well. It's a thorough examination of how Britain squandered their early computing lead in the WWII & postwar periods by shutting skilled women out of computer-related work in government and industry.