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The reason most electrical plug prongs have holes in them

Источник Engadget 科技1 дней назад
Аннотация

If you've ever looked at the end of a plug, you've probably wondered why some have holes, and some don't - and no, it's not actually a big conspiracy theory.

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The reason most electrical plug prongs have holes in them · Всеобъемлющее обозрение