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Numeric keypad

On a telephone the numeric keys are ordered differently from a calculator. That is how it is.

 


Format

On a telephone the digits run from top to bottom, on a calculator they run from bottom to top.

1 2 3 7 8 9
4 5 6 4 5 6
7 8 9 1 2 3
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telephone calculator

 


History

Scottish inventor Alexander Graham Bell built the first usable telephone. German inventor Philipp Reis coined the name Telephon.


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