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The blades are oriented like a modern 20 amp, 240 volt outlet--less ground, of course. Whereas a 120 volt, 20 amp outlet (the kind many of us have in our kitchens) can accept either a common 15 amp plug with its vertical blades or a 20 amp plug that has its left blade in horizontal plane, the 240 volt version is mirror image, preventing any 120 volt plug from being inserted. It's odd then that anybody would bother with them on a 120 volt circuit. I recall the locking-style outlets being fairly common in old industrial installations around here, but there's an obvious practicality to that. I don't get installing an odd outlet just to be odd.
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