Why Do Electrical Prongs Have Holes In Them? | HowStuffWorks

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• Why Do Electrical Plugs Have Holes?

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• Why Do US Power Plugs Have Holes In Them? Why Are They ... - Quora

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• ELI5: Why Do Plug Ins Have Holes In The Prongs That Plug Into The Wall?

• Why Do The Prongs On American Plugs Have Holes In Them? - Reddit