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A strange outlet in the kitchen in my 100 year old apartment in the United States. The two middle holes function fine as a two prong outlet but I am unsure of
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What Is the Difference Between Two- and Three-pronged Plugs? | HowStuffWorks
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2 Prong Outlets - 2 Prong to 3 Prong Adapter - 2 Prong Outlet Upgraded to 3 Prong - YouTube
