Modular "Mother" Radio from 1948
There's a little bit of everything in this scan from a 1948 Popular Science article, whether you're a fan of user-serviceable modular electronics or just misogynist condescension. Titled "Mother Could Fix This Radio," it shows off the first production model radio from Cosmo Electronics Corporation in New York City, built to allow each of the five different parts of the radio to be replaced with easy color-coded "tubes." (I think it's interesting that the physical form of vacuum tubes implied modernity at the time, although maybe that's just a reflection of the way that made the most sense to organize all the parts.)
I've written for both of the Popular * at one point. I get a kick out of thinking I could pitch an article titled "Even Vagina-Saddled Womb Beasts Could Buy This HDTV!" and then point furiously to their own back-issues as they escort me out of the lobby.
Mother Could Fix This Radio [Modern Mechanix]

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I think that "Vagina-Saddled Womb Beast" is going to be one of the new monsters in the next World of Warcraft expansion.
Even "Mother" could tell you that there are six colour-coded tubes, not five. :-)