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Anyone seen this plug before


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Well, they're not necessarily as old as all that. I remember being able to walk into a hardware store & buy those and I'm a young guy.

Around here, they're quite common in '50s & '60 housing stock.

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These are a little more rare:

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We see the quintets all the time around here. Must be one of those regional things again.

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Not necessarily "ungrounded" although there is obviously no place for the "ground" prong of a three prong receptacle. If the receptacle is attached (installed in) to a metal box and wired with armored cable back to the main service panel, which should be grounded, then you may have grounding there.

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