When did the whole polarized plug thing come about? I find it hard to believe that is from 1928. Because I have a old lamp I got a garage sale a Nice old floor Takes the big Street light style bulbs on the top and has 3 sockets around the edges that take a standard bulb. and the plug is not polarized neither is the plug on my Moms old iron or Stereo. Oh I rewired that lamp because it had cloth cord which was in very bad shape. and the plug was also missing the deadfront Cover (It was one of those plugs where you can see the terminals while looking down at the prongs)
