Some T shapes outlets are meant to accept plugs with blades in either orientation, either vertical or horizontal rather than a T shaped blade. Most of the "adaptable" outlets I've seen only have 1 T slot with the other a normal blade.
I don't know if the NEMA standards for outlets and plugs had been developed by wartime, certainly not with the ground lug.
Last edited by Grant Bowker; 06-12-20 at 23:30.
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