They came first about 16 years latter they came up with the Phillip’s drivers and have been changing it ever since because they slipped with powered drivers that's why you still see them in things like RV's and Kerg tools, and deck screws. The screw on a romex connector looks like a Phillips but it's not it is a Robertson and a slot the same with breakers and grounding lugs they do not slip out of the driver slot. Ever installed outlets with a flat driver because a Phillips slips? Try a #1 Robertson next time. Over the years they tried all kinds of screw drive slots the only ones that have endured unchanged are the Robertson's As you have seen from my call I'm from the south so I have used both types of drivers but my electrical tool bag has Robertson drivers because they work and I can use them on my camper!
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