The only reason Robertson isn’t everywhere is that it was patented and Robertson refused to license it, insisting that his company would be the only one to manufacture it.
Because of that, Henry Ford used those screws on the Canadian-made Model T cars, but not on the American made ones. The patent didn’t expire until 1964, so many other screw types that weren’t patented became popular in the mean time. But, the patent has now been expired for 60 years, so I think it’s ok to just call it “square” now.
The real propaganda is labelling Robertson square.
The only reason Robertson isn’t everywhere is that it was patented and Robertson refused to license it, insisting that his company would be the only one to manufacture it.
Because of that, Henry Ford used those screws on the Canadian-made Model T cars, but not on the American made ones. The patent didn’t expire until 1964, so many other screw types that weren’t patented became popular in the mean time. But, the patent has now been expired for 60 years, so I think it’s ok to just call it “square” now.