I have seen the Square D GFCI outlets before. In fact I have one in my collection of old items, labelled as Bell. I also have an old GE GFCI outlet, posted in some old threads here.
Does anyone come across any of these old outlets anymore? The oldest I typically see are the Eagle ones with the sideways outlets. Even those only go back to the 1990s I guess. Leviton GFCIs in the 1990s and possibly 1980s looked pretty much like they do now, but without the indicator lights.
