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![Telephone design: A brief history. [PHOTOS]](http://www.slate.com/content/dam/slideshows/life/design/2012/05/14/hello-a-visual-history-of-the-phone/jcr%3Acontent/slideshow/2/images%252Fslides%252Fphone03_candlestickphone.jpg "Telephone design: A brief history. [PHOTOS]")