JimVanDeventerA Pseudo Schuko with Hole-less Type A Pins
voxelidk I’m not from the us but i think these are pretty common?
th3dogcowhole is just there for making production easier
The holes allow the socket to grip the plug more firmly according to this page.
But, yes. These plugs are completely normal in Japan at least.
technology connections made a video on it, none of the plugs actually use the holes
