Mr. Karlin, a Bell Labs industrial research psychologist, was also instrumental in the shortening of telephone cords and the creation of rectangular keypads for touch-tone models.

Source: http://www.nytimes.com/2013/02/09/business/john-e-karlin-who-led-the-way-to-all-digit-dialing-dies-at-94.html?partner=rss&emc=rss

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