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^ 'Why is the keypad arrangement different for a telephone and a calculator?'.

The Bell System Technical Journal (July, 1960): 995. 'Human Factor Engineering Studies of the Design and Use of Pushbutton Telephone Sets' (PDF).

^ 'Monmouth man, inventor of touch-tone keypad, dies at 94'.

Karlin, Who Led the Way to All-Digit Dialing, Dies at 94'.

^ a b Fox, Margalit (February 8, 2013).

^ 'Sundstrand Adding Machine - Underwood Sundstrand'.

^ 'William and Hubert Hopkins machines'.

Additionally, on a rotary telephone, the '1' hole was at the top, albeit at the top right.

By placing the '1' key in the upper left, the alphabet was arranged in the normal left-to-right descending order for English characters.

'27' was given out as 'CRestview', '26' as 'ATwood', etc. These alpha sequences were mapped to words. where commonly given out using alphabetical characters for the first two digits. Another explanation proposed is that at the time of the introduction of the telephone keypad, telephone numbers in the U.S.One popular theory suggests that the reason is similar to that given for the QWERTY layout, the unfamiliar ordering slowed users to accommodate the slow switches of the late 1950s and early 1960s.Despite the conclusions obtained in the study, there are several popular theories and folk histories explaining the inverse order of telephone and calculator keypads.

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