Keypad (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Keypad" in English language version.

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2web.archive.org

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1switchandclick.com

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1electricity-magnetism.org

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1nelson-miller.com

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1history-computer.com

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1retrocalculators.com

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1howstuffworks.com

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ascend.com

Deininger, R. L. (July 1960). "Human Factor Engineering Studies of the Design and Use of Pushbutton Telephone Sets" (PDF). The Bell System Technical Journal. 39: 995. doi:10.1002/j.1538-7305.1960.tb04447.x. Archived from the original (PDF) on 2014-01-24. Retrieved 2014-02-07.

doi.org

Deininger, R. L. (July 1960). "Human Factor Engineering Studies of the Design and Use of Pushbutton Telephone Sets" (PDF). The Bell System Technical Journal. 39: 995. doi:10.1002/j.1538-7305.1960.tb04447.x. Archived from the original (PDF) on 2014-01-24. Retrieved 2014-02-07.

electricity-magnetism.org

"Capacitive keypads". Retrieved 2023-12-17.

espacenet.com

worldwide.espacenet.com

"Touch sensor". Retrieved 2023-08-04.

farnell.com

"Resistive membrane keypad" (PDF). Retrieved 2023-12-19.

history-computer.com

"William and Hubert Hopkins machines". Retrieved 2017-07-18.

howstuffworks.com

"Why is the keypad arrangement different for a telephone and a calculator?". How Stuff Works. 2001-05-22. Retrieved 2014-02-07.

ign.com

"Optical keypads". Retrieved 2023-12-17.

nelson-miller.com

"Piezo keypads". Retrieved 2023-12-17.

nj.com

"Monmouth man, inventor of touch-tone keypad, dies at 94". The Star-Ledger. 2013-02-09. Archived from the original on 2013-02-13. Retrieved 2013-02-09.

nytimes.com

Fox, Margalit (2013-02-08). "John E. Karlin, Who Led the Way to All-Digit Dialing, Dies at 94". The New York Times. Retrieved 2013-02-09.

retrocalculators.com

"Sundstrand Adding Machine - Underwood Sundstrand". Retrieved 2017-07-18.

screwfix.com

"Mechanical push-button keypad". Retrieved 2023-12-17.

switchandclick.com

"Mechanical keypad". Retrieved 2023-12-17.

ti.com

"Inductive keypads" (PDF). Retrieved 2023-12-17.

voltcave.com

"Mechanical keypads". Retrieved 2023-12-17.

web.archive.org

"Monmouth man, inventor of touch-tone keypad, dies at 94". The Star-Ledger. 2013-02-09. Archived from the original on 2013-02-13. Retrieved 2013-02-09.
Deininger, R. L. (July 1960). "Human Factor Engineering Studies of the Design and Use of Pushbutton Telephone Sets" (PDF). The Bell System Technical Journal. 39: 995. doi:10.1002/j.1538-7305.1960.tb04447.x. Archived from the original (PDF) on 2014-01-24. Retrieved 2014-02-07.