The year was 1960, and phones were changing. It was the beginning of the end for rotary dialing, and buttons were the future. But engineers faced an important, looming question: what order do you put those buttons in? Turns out there were a lot of options. Before ultimately settling on the layout we know and love today, the brainiacs at Bell Labs ran tests with hundreds of dialers, keeping close watch on what layouts were the speediest, most accurate, and most preferred.
Apparently, the ultimate deciding factor was the ease and efficiency of manufacturing.
DUMMR.com 
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