Why Electrical Plugs Have Holes? Let's Find Out

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News Articles: Courtesy New York Times
Patent Design & Picture: Connecticut History
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Patent diagram image source: en.m.wikipedia.org/wiki/File:...
Author David
Date and time of data generation 16:04, 17 November 2013
Music: Indian Walk ,Musician: Nico Staf ,,Site: studio.youtube.com/
Disclaimer:
Due to factors beyond the control of MGFactor, I cannot guarantee against improper use or unauthorized modifications of this information. MGFactor assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. MGFactor recommends safe practices when working on machines and or with tools seen or implied in this video. Due to factors beyond the control of MGFactor, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not MGFactor.
00:00 Introduction
00:15 Introduction
00:39 History
01:04 Application
01:18 Modern Outlet
01:47 Explanation
02:33 Conclusion
02:55 Thanks for Watching

[@arunkumarpandey5660]

Very useful.