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A comment on Why telephone keypads are arranged the way they are.

Re:Why telephone keypads are arranged the way they are by Nano2rad on Saturday August 29, 2015 @07:21PM (#10141693)
The final winner three-by-three plus one is the only one suitable for mobile phone. Perhaps because in mobile phone screen is used as reference; in the phone keyboard the receiver used as reference. In the calculator and adding machine are not moved around and the table is used as reference.
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Re:Why telephone keypads are arranged the way they are by jpatokal on Sunday August 30, 2015 @08:59AM (#10143173)
The blog post describes a study published in 1960.
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