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Trees Sneezing: Why Do Electrical Plugs Have Holes In Them?
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Why Do Electrical Plugs Have Holes? - Facts.net
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Hole Plugs
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What Those Holes in Your Electrical Plugs Are for - SolidSmack
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Why Do Electrical Plugs Have Holes? (Answered)
Why Do Electrical Prongs Have Holes in Them? | HowStuffWorks
Lee Valley Decorative Hole Plugs - Lee Valley Tools
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Why do US power plugs have holes in them? Why are they different sizes when in Europe, both sides are the same size? - Quora